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1、五 年 级 解 方 程 练 习 题180 题 及 答 案名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 1 页,共 19 页 - - - - - - - - - 五年级解方程(1)(0.5+x)+x=9.82 (2)2(X+X+0.5)=9.8 (3)25000+x=6x (4)3200=440+5X+X (5)X-0.8X=6 (6)12x-8x=4.8 (7) 7.5+2X=15 (8)1.2x=81.6 (7)x+5.6=9.4 (10)x-0.7x=3.6 (11)91 x1
2、.3 (12) X+8.3=10.7 (13) 15x3 (14) 3x 816 (15) 3x+9=27(16) 18(x-2)=270 (17) 12x=300-4x (18) 7x+5.3=7.4 (19) 3x5=4.8 (25) 0.5x+8=43 (26) 6x-3x=18 (27) 7(6.5+x)=87.5 (28) 0.273 x=0.35 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 2 页,共 19 页 - - - - - - - - - (29) 1.8x=
3、0.972 (30) x0.756=90 (31) 0.1(x+6)=3.30.4 (32) (27.5-3.5)x=4 (33) 9x-40=5 (34) x5+9=21 (35) 48-27+5x=31 (36) 10.5+x+21=56 (37) x+2x+18=78 (38) (200-x)5=30 (39) (x-140)70=4 (40) 20-9x=2 (41) x+19.8=25.8 (42) 5.6x=33.6 (43) 9.8-x=3.8 (44) 75.6 x=12.6 (45) 5x+12.5=32.3 (46) 5(x+8)=102 (47) x+3x+10=70 (
4、48) 3(x+3)=50-x+3 (49) 5x+15=60 (50) 3.5-5x=2 (51) 0.3 7+4x=12.5 (52) x 1.5-1.25=0.75 (53) 4x-1.36=2.6 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 3 页,共 19 页 - - - - - - - - - (54) 6x+12.8=15.8 (55) 150 2+3x=690 (56) 2x-20=4 (57) 3x+6=18 (58) 2(2.8+x)=10.4 (59) (x
5、-3)2=7.5 (60) 13.2x+9x=33.3 (61) 3x=x+100 (62) x+4.8=7.2 (63) 6x+18=48 (64)3(x+2.1)=10.5 (65)12x-9x=8.7 (66)13(x+5)=169 (67) 2x-97=34.2 (68)3.4x-48=26.8 (69)42x+25x=134 (70)1.5(x+1.6)=3.6 (71)2(x-3)=5.8 (72)65x+7=137(73) 9x+4 2.5 91 (74) 4.2 x+2.5x134 (75) 10.5x+6.5x=51 (76) 89x-43x=9.2 (77) 5x-45=1
6、00 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 4 页,共 19 页 - - - - - - - - - (78) 1.2x-0.5x=6.3 (79) 23.4=2x(80) 4x-x=48.6 (81) 4.5x-x=28 (82)X-5.7=2.15 (83)5X-2X=18 (84)3X+0.7=7 (85) 3.5 2= 4.2+x (86) 26 1.5= 2x+10 (87) 0.516160.2=4x (88) 13 9.25X=0.403 (89) 18.9X
7、=0. 3 (90) 23x=14x 27 (91) x 14x=75(92)955x80 (93)1.8 +6x 54 (94) 6.7x 60.3 6.7 (95) 9 4x53(96) 2x+8=16 (97) 20 x-14x=24 (98) x+7x=8 (99) 9x-3x=6 (100) 6x-8=4 (101) 5x+x=9 (102) 8x-8=6x 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 5 页,共 19 页 - - - - - - - - - (103)
8、 54x=20 (104) 2x-6=12 (105 ) 7x+7=14 (106) 6x-6=0 (107) 5x+6=11 (108) 2x-8=10 (109) 2.5x-8=4 (110) x-43=7 (111)3x+7=28 (112) 3x-7=26 (113) 9x-x=16 (114) 24x+x=50 (115) 1.2x-8=4 (116) 3x-8=31 (117) 6x+6=12 (118) 3x-3=3 (119) 5x-3x=4 (120) 2x+16=19 (121) 5x+8=19 (122) 14-6x=8 (123) 15+6x=27 (124) 5-8x
9、=4 (125) 7x+8=15 (126) 9-2x=1 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 6 页,共 19 页 - - - - - - - - - (127) 4+5x=9 (128) 10-x=8 (129) 8x+9=17 (130) 9+6x=15 (131) x+9x=4+7 (132) 2x+9=17 (133) 8-4x=6 (134) 6x-7=28 (135) 7x-9=20(136) x-56=1 (137) 8-7x=1 (138)x-30=12
10、 (139) 6x-21=21 (140) 6x-3=6 (141) 9x=18 (142) 4x-18=14 (143) 5x+9=11 (144) 17-2x=11 (145) x+4+8=23 (146) 7x-12=9 (147) X-5.7=2.15 (148) 5X-2X=18 (149) 3X +0.5=5 (150) 3.52= 4 x (151) 261.5= 2x 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 7 页,共 19 页 - - - - - - - -
11、 - (152) 0.516160.1=4x (153) 9.26X=0.402(154) 36.9X=0.3 (155) X 0.5=2.6 (156) 93 5x80 (157) 180-6x54 (158) 9 4x40 (159) 0.2x0.4 0.5 3.7 (160) 9.4x0.4x 16.2 (161) 92 4x20 (162) 7x 6=1.4 (163) 16x 34x=1 (164) 18x 14x=12 (165) 3 x4214=15 (166) 12 4x=56 (167) 22 14x=12(168) X+8.3=10.7 (169) 5x 30 (170)
12、x-5.6=9.4 (171) x 0.8=90 (172) 3x 816 (173) 3x+9=27 (174) 5.3+7x=7.4 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 8 页,共 19 页 - - - - - - - - - (175) 3x 5=4.8 (176) X-0.8X=6 (177) 12x+8x=4.8 (178) 7(x-2)=49 (179) 4 8+2x=36 (180) (x-2)3=7 (181) x 5+9=21 (182)(300-x)5
13、=30 (183) 91 x 1.3 (184) 41-3x=17 五年级解方程 180题答案(1)(0.5+x)+x=9.82 0.5+2x=4.9 0.5+2x-0.5=4.9-0.5 2x=4.4 2x2=4.42 X=2.2 (2)2(X+X+0.5)=9.8 2x+2x+1=9.8 4x+1-1=9.8-1 4x=8.8 4x4=8.84 X=2.2 (3)25000+x=6x 25000+x-x=6x-x 5x=25000 5x 5=250005 X=5000 (4)3200=440+5X+X 6x+440=3200 6x+450-450=3200-440 6x=2760 6x6=
14、27606 X=460 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 9 页,共 19 页 - - - - - - - - - (5)X-0.8X=6 0.2x=6 0.2x0.2=60.2 X=30 (6)12x-8x=4.8 4x=4.8 4x4=4.84 X=1.2 (7) 7.5+2X=15 2x+7.5-7.5=15-7.5 2x=7.5 2x2=7.52 X=3.75 (8) 1.2x=81.6 1.2x 1.2=81.6 1.2 X=68 (9) x+5.6=9.4
15、X+5.6-5.6=9.4-5.6 X=3.8 (10)x-0.7x=3.6 0.3x=3.6 0.3x 0.3=3.6 0.3 X=12 (11)91 x1.3 91 xx=1.3 x 1.3x=91 1.3x 1.3=911.3 X=70 (12) X+8.3=10.7 X+8.3-8.3=10.7-8.3 X=2.4 (13) 15x3 15x15=315 X=0.2 (14) 3x 816 3x-8+8=16+8 3x=24 3x 3=243 X=8 (15) 3x+9=27 3x+9-9=27-9 3x=18 3x3=183 3x=6 (16) 18(x-2)=270 18x-36=
16、270 18x-36+36=270+36 18x=306 18x18=30618 X=17 (17) 12x=300-4x 12x+4x=300-4x+4x 16x=300 16x 16=30016 X=18.75 (18) 7x+5.3=7.4 7x+5.3-5.3=7.4-5.3 7x=2.1 7x7=2.17 X=0.3 (19) 3x5=4.8 3x55=4.85 3x=24 3x3=243 X=8 (20) 30 x+25=85 30 x+25-25=85-25 30 x=60 30 xx=60 x 30=60 x 60 x60=3060 X=0.5 (21) 1.48-2x=6 1
17、1.2-2x+2x=6+2x 11.2=6+2x 2x+6-6=11.2-6 2x=5.2 2x2=5.22 X=2.6 (22) 6x-12.83=0.06 6x-38.4=0.06 6x=38.46 6x6=38.466 X=6.41 (23) 410-3x=170 410-3x+3x=170+3x 170+3x=410 3x+170-170=410-170 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 10 页,共 19 页 - - - - - - - - - 3x=240
18、3x3=2403 X=80 (24) 3(x+0.5)=21 3x+1.5=21 3x+1.5-1.5=21-1.5 3x=19.5 3x3=19.53 X=6.5 (25) 0.5x+8=43 0.5x+8-8=43-8 0.5x=35 0.5x0.5=350.5 X=70 (26) 6x-3x=18 3x=18 3x3=183 X=6 (27) 7(6.5+x)=87.5 7x+45.5=87.5 7x+45.5-45.5=87.5-45.5 7x=42 7x7=427 X=6 (28) 0.273x=0.35 x=0.2730.35 X=0.78 (29) 1.8x=0.972 1.8x
19、1.8=0.972 1.8 X=0.54 (30) x0.756=90 x0.756 0.756=900.756 X=68.04 (31) 0.1(x+6)=3.30.4 0.1x+0.6=1.32 0.1x+0.6-0.6=1.32-0.6 0.1x=0.72 0.1x0.1=0.72 0.1 X=7.2 (32) (27.5-3.5)x=4 24x=4 x=244 X=6 (33) 9x-40=5 9x-40+40=5+40 9x=45 9x9=459 X=5 (34) x5+9=21 x5+9-9=21-9 x5=12 x55=125 X=60 (35) 48-27+5x=31 5x+2
20、1-21=31-21 5x=10 5x5=105 X=2 (36) 10.5+x+21=56 x+31.5-31.5=56-31.5 x=24.5 (37) x+2x+18=78 3x+18-18=78-18 3x=60 3x3=603 X=20 (38) (200-x)5=30 (200-x)55=305 200-x=150 200-x+x=150+x 150+x=200 X+150-150=200-150 X=50 (39) (x-140)70=4 (x-140)7070=470 X-140=280 X-140+140=280+140 X=420 (40) 20-9x=2 9x=20-2
21、9x=18 9x9=189 X=2 (41) x+19.8=25.8 X+19.8-19.8=25.8-19.8 X=6 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 11 页,共 19 页 - - - - - - - - - (42 ) 5.6x=33.6 5.6x5.6=33.6 5.6 X=6 (43) 9.8-x=3.8 9.8-x+x=3.8+x 3.8+x=9.8 X=9.8-3.8 X=6 (44) 75.6 x=12.6 X=75.612.6 X=6 (45) 5x
22、+12.5=32.3 5x+12.5-12.5=32.3-12.5 5x=19.8 5x5=19.85 X=3.96 (46) 5(x+8)=102 5x+40=102 5x+40-40=102-40 5x=62 5x5=625 X=12.4 (47) x+3x+10=70 4x+10=70 4x+10-10=70-10 4x=60 4x4=604 X=15 (48) 3(x+3)=50-x+3 3x+9=53-x 3x+x+9-9=53-x+x-9 4x=44 4x4=444 X=11 (49) 5x+15=60 5x+15-15=60-15 5x=45 5x5=455 X=9 (50) 3
23、.5-5x=2 3.5-5x+5x=2+5x 5x+2=3.5 5x+2-2=3.5-2 5x=1.5 5x5=1.55 X=0.3 (51) 0.3 7+4x=12.5 4x+2.1=12.5 4x+2.1-2.1=12.5-2.1 4x=10.4 4x4=10.44 X=2.6 (52) x 1.5-1.25=0.75 x1.5-1.25+1.25=0.75+1.25 x1.5=2 x1.5 1.5=21.5 X=3 (53) 4x-1.36=2.6 4x-1.36+1.36=2.6+1.3 6 4x=10.4 4x4=10.44 X=2.6 (54) 6x+12.8=15.8 6x+12
24、.8-12.8=15.8-12.8 6x=3 6x6=36 X=0.5 (55) 150 2+3x=690 3x+300=690 3x+300-300=690-300 3x=390 3x3=3903 X=130 (56) 2x-20=4 2x-20+20=4+20 2x=24 2x2=242 X=12 (57) 3x+6=18 3x+6-6=18-6 3x=12 3x3=123 X=4 (58) 2(2.8+x)=10.4 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 12 页,共
25、 19 页 - - - - - - - - - 5.6+2x=10.4 2x+5.6-5.6=10.4-5.6 2x=4.8 2x2=4.82 X=2.4 (59) (x-3)2=7.5 (x-3 )22=7.52 X-3=15 X=18 (60) 13.2x+9x=33.3 22.2x=33.3 22.2x22.2=33.3 22.2 X=1.5 (61) 3x=x+100 3x-x=x-x+100 2x=100 2x2=1002 X=50 (62) x+4.8=7.2 X=7.2-4.8 X=2.4 (63) 6x+18=48 6x+18-18=48-18 6x=30 6x6=306 x=
26、5 (64)3(x+2.1)=10.5 3x+6.3=10.5 3x=10.5-6.3 3x=4.2 3x3=4.23 X=1.4 (65)12x-9x=8.7 3x=8.7 3x3=8.73 X=2.9 (66)13(x+5)=169 13x+65=169 13x+65-65=169-65 13x=104 13x13=10413 X=8 (67) 2x-97=34.2 2x-97+97=34.2+97 2x=131.2 2x2=131.22 X=65.6 (68)3.4x-48=26.8 3.4x-48+48=26.8+48 3.4x=74.8 3.4x3.4=74.8 3.4 X=22 (
27、69)42x+25x=134 67x=134 67x67=13467 X=2 (70)1.5(x+1.6)=3.6 1.5x+2.4=3.6 1.5x=3.6-2.4 1.5x=1.2 1.5x1.5=1.2 1.5 X=0.8 (71)2(x-3)=5.8 2x-6=5.8 2x-6+6=5.8+6 2x=11.8 2x2=11.82 X=5.9 (72)65x+7=137 65x+7-7=137-7 65x=130 65x65=13065 X=2 (73) 9x+4 2.5 91 9x+10=91 9x+10-10=91-10 9x=81 9x9=819 X=9 (74) 4.2 x+2.
28、5x134 6.7x=134 6.7x6.7=1346.7 X=20 (75) 10.5x+6.5x=51 17x=51 17x17=5117 X=3 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 13 页,共 19 页 - - - - - - - - - (76) 89x-43x=9.2 46x=9.2 46x46=9.246 X=0.2 (77) 5x-45=100 5x-45+45=100+45 5x=145 5x5=1455 X=29 (78) 1.2x-0.5x=6.3
29、0.7x=6.3 0.7x0.7=6.3 0.7 X=9 (79) 23.4=2x 2x2=23.42 X=11.7 (80) 4x-x=48.6 3x=48.6 3x3=48.63 X=16.2 (81) 4.5x-x=28 3.5x=28 3.5x3.5=283.5 X=8 (82 )X-5.7=2.15 X=5.7+2.15 X=7.85 (83)5X-2X=18 3x=18 3x3=183 X=6 (84)3X+0.7=7 3x+0.7-0.7=7-0.7 3x=6.3 3x3=6.33 X=2.1 (85) 3.5 2= 4.2+x 4.2+x=7 X=7-4.2 X=2.8 (86
30、) 26 1.5= 2x+10 2x+10=39 2x+10-10=39-10 2x=29 2x2=292 X=14.5 (87) 0.516160.2=4x 4x=4.8 4x4=4.8 4 X=1.2 (88) 13 9.25X=0.403 X=139.25-0.403 X=138.847 (89) 18.9X=0. 3 X=18.90.3 X=63 (90) 23x=14x 27 23x-14x=14x-14x+27 9x=27 9x 9=279 X=3 (91) x 14x=75 15x=75 15x15=7515 X=5 (92)955x80 95-5x+5x=80+5x 5x+80
31、=95 5x+80-80=95-80 5x=15 X=3 (93)1.8 +6x 54 6x=54-1.8 6x=52.2 6x6=52.26 X=8.7 (94) 6.7x 60.3 6.7 6.7x=60.3+6.7 6.7x=67 6.7x6.7=676.7 X=10 (95) 9 4x53 4x=53-9 4x=44 4x4=444 X=11 (96) 2x+8=16 2x=16-8 2x=8 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 14 页,共 19 页 - - -
32、 - - - - - - 2x2=82 X=4 (97) 20 x-14x=24 6x=24 6x6=246 X=4 (98) x+7x=8 8x=8 X=1 (99) 9x-3x=6 6x=6 X=1 (100 )6x-8=4 6x-8+8=4+8 6x=12 X=2 (101) 5x+x=9 6x=9 6x6=96 x=1.5 (102) 8x-8=6x 8x-8+8=6x+8 8x-6x=6x-6x+8 2x=8 2x2=82 X=4 (103) 54x=20 54x54=2054 X=25 (104) 2x-6=12 2x-6+6=12+6 2x=18 2x2=182 X=9 (105
33、 ) 7x+7=14 7x+7-7=14-7 7x=7 7x7=77 X=1 (106) 6x-6=0 6x-6+6=0+6 6x=6 X=1 (107) 5x+6=11 5x+6-6=11-6 5x=5 X=1 (108) 2x-8=10 2x-8+8=10+8 2x=18 X=9 (109) 2.5x-8=4 2.5x-8+8=4+8 2.5x=12 2.5x2.5=122.5 X=4.8 (110) x-43=7 X-43+43=7+43 X=7.75 (111) 3x+7=28 3x+7-7=28-7 3x=21 3x3=213 X=7 (112) 3x-7=26 3x-7+7=26+
34、7 3x=33 3x3=333 X=11 (113) 9x-x=16 8x=16 8x8=168 X=2 (114) 24x+x=50 25x=50 25x25=5025 X=2 (115) 1.2x-8=4 1.2x-8+8=4+8 1.2x=12 1.2x1.2=121.2 X=10 (116) 3x-8=31 3x-8+8=31+8 3x=39 3x3=393 X=13 (117) 6x+6=12 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 15 页,共 19 页 - -
35、- - - - - - - 6x+6-6=12-6 6x=6 X=1 (118) 3x-3=3 3x-3+3=3+3 3x=6 3x3=63 X=2 (119) 5x-3x=4 2x=4 2x2=42 X=2 (120) 2x+16=19 2x+16-16=19-16 2x=3 2x2=32 X=1.5 (121) 5x+8=19 5x+8-8=19-8 5x=11 5x5=115 X=2.2 (122) 14-6x=8 14-6x+6x=8+6x 6x+8-8=14-8 6x=6 X=1 (123) 15+6x=27 6x+15-15=27-15 6x=12 6x6=126 X=2 (124
36、) 5-8x=4 5-8x+8x=4+8x 8x+4-4=5-4 8x=1 8x8=18 X=0.125 (125) 7x+8=15 7x+8-8=15-8 7x=7 X=1 (126) 9-2x=1 9-2x+2x=1+2x 2x+1-1=9-1 2x=8 2x2=82 X=4 (127) 4+5x=9 5x+4-4=9-4 5x=5 X=1 (128) 10-x=8 X=10-8 X=2 (129) 8x+9=17 8x+9-9=17-9 8x=8 X=1 (130) 9+6x=15 6x+9-9=15-9 6x=6 X=1 (131) x+9x=4+7 10 x=11 10 x10=11
37、10 X=1.1 (132) 2x+9=17 2x+9-9=17-9 2x=8 2x2=82 X=4 (133) 8-4x=6 8-4x+4x=6+4x 4x+6-6=8-6 4x=2 4x2=24 X=0.5 (134) 6x-7=28 6x-7+7=28+7 6x=36 6x6=366 X=6 (135) 7x-9=20 7x-9+9=8+20 7x=28 7x7=287 X=4 (136) x-56=1 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 16 页,共 19 页 -
38、 - - - - - - - - X=56+1 X=57 (137) 8-7x=1 8-7x+7x=1+7x 7x+1-1=8-1 7x=7 X=1 (138) x-30=12 X-30+30=12+30 X=42 (139) 6x-21=21 6x-21+21=21+21 6x=42 6x6=426 X=7 (140) 6x-3=6 6x-3+3=6+3 6x=9 6x6=96 X=1.5 (141) 9x=18 9x9=189 X=2 (142) 4x-18=14 4x-18+18=14+18 4x=32 4x4=324 X=8 (143) 5x+9=11 5x+9-9=11-9 5x=2
39、 5x5=25 X=0.4 (144) 17-2x=11 17-2x+2x=11+2x 2x+11-11=17-11 2x=6 2x2=62 X=3 (145) x+4+8=23 X+12=23 X=23-12 X=11 (146) 7x-12=9 7x-12+12=9+12 7x=21 7x7=217 X=3 (147) X-5.7=2.15 x=5.7+2.15 X=7.85 (148) 5X-2X=18 3x=18 3x3=183 X=6 (149) 3X +0.5=5 3x+0.5-0.5=5-0.5 3x=4.5 3x3=4.53 X=1.5 (150) 3.52= 4 x 4x=7
40、 4x4=74 X=1.75 (151) 26 1.5= 2x 2x=39 2x2=392 X=18 (152) 0.516160.1=4x 4x=6.4 4x4=6.44 X=1.6 (153) 9.26X=0.402 X=9.26-0.402 X=8.858 (154) 36.9X=0.3 X=36.90.3 X=123 (155) X 0.5=2.6 X=0.52.6 X=1.3 (156) 93 5x80 93-5X+5X=80+5X 5X+80-80=93-80 5X=13 5X5=135 X=2.6 (157) 180-6x54 180-6X+6X=54+6X 名师资料总结 - -
41、 -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 17 页,共 19 页 - - - - - - - - - 6X+54-54=180-54 6X=126 6X6=1266 X=21 (158) 9 4x40 4X+9-9=40-9 4X=31 4X4=314 X=7.75 (159) 0.2x0.4 0.5 3.7 0.2X-0.5+0.5-0.4+0.4=3.7-0.5+0.4 0.2X=3.6 0.2X0.2=3.6 0.2 X=18 (160) 9.4x0.4x 16.2 9X=16.2 9X9=
42、16.29 X=1.8 (161) 92 4x20 92-4X+4X=20+4X 4X+20-20=92-20 4X=72 4X4=724 (162) X=18 (163) 7x 6=1.4 7x66=1.46 7X=8.4 7X7=8.47 X=1.2 (163) 16x 34x=1 50X=1 50X50=150 X=0.02 (164) 18x 14x=12 4X=12 4X4=124 X=3 (165) 3 x4214=15 3X-3=15 3X-3+3=15+3 3X=18 3X3=183 X=6 (166) 12 4x=56 4X+12-12=56-12 4X=44 4X4=444
43、 X=11 (167) 22 14x=12 22-14X+14X=12+14X 14X+12-12=54-12 14X=42 14X14=4214 X=3 (168) X+8.3=10.7 X=10.7-8.3 X=2.4 (169) 5x 30 5X5=305 X=6 (170) x-5.6=9.4 X=5.6+9.4 X=15 (171) x 0.8=90 X=0.890 X=72 (172) 3x 816 3X-8+8=16+8 3X=24 3X 3=243 X=8 (173) 3x+9=27 3X+9-9=27-9 3X=18 3X3=183 X=6 (174) 5.3+7x=7.4
44、7X+5.3-5.3=7.4-5.3 7X=2.1 7X 7=2.17 X=0.3 (175) 3x 5=4.8 3X=4.85 3X=24 3X3=243 X=8 (176) X-0.8X=6 0.2X=6 0.2X0.2=60.2 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 18 页,共 19 页 - - - - - - - - - X=30 (177) 12x+8x=4.8 20X=4.8 20X20=4.820 X=24 (178) 7(x-2)=49 7X-14=49
45、7X-14+14=49+14 7X=63 7X 7=637 X=9 (179) 4 8+2x=36 2X+32=36 2X+32-32=36-32 2X=4 2X2=42 X=2 (180) (x-2)3=7 X-2=37 X-2=21 X=23 (181) x 5+9=21 X5=21-9 X5=12 X=125 X=60 (182) (300-x)5=30 300-X=305 300-X=150 X=300-150 X=150 (183) 91 x 1.3 X=911.3 X=70 (184) 41-3x=17 41-3X+3X=17+3X 3X+17-17=41-17 3X=24 3X3=243 X=8 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 19 页,共 19 页 - - - - - - - - -