六年级解方程专项练习题5423.pdf

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1、 题六年级解方程专项练习 200 x=1.22x),(1)x(9=,(10)931.7x=13.4,=x,2()(11)x25%x=24,(3),4x=+0.2=,x 12()2x=13.6 2.5 84()(13)0.6x+90%x=78,:)(5 0.78x=35 (14),20%x=0.4)(61 20%x2.43=0.8,x=42,=6)x(1)8(,x(15),0.6x+32.5=67.5(16)=3,(23)4x ),=5)x1(0.45(17(24)12x+70.3=20.1,2.25=8.25,x(18)x=,(25x+),:19):x=312(42=,26)x:(20()x+

2、0.8=5.6,x=,0.5+(27):x=121)1.4(:0.75,:=0.48:x,0.8(28)=,)(,=24)2((22)x29 )37x=1.04,:39(30)42:=x=21,(40)x,5x0.4=75%(31)x=14,x(41),(32)6x0.9=4.5 x=)3x,(42 2(33)()=5.8,3x ,(34)1.6x=6.4),(43=9=293(35)4x,=44)1.2:,(16+8x=40)(36,=:(45),x37()1.1=3,0.8=x(46):(,+2x=)38 :,:0.3=,(55)(47)xx=+1 +25%x48)1,25%X+25%x=

3、(56)150%x+66=99 ,=(57)x+60.8x=16(49 X=,)58(50(551():8=x:,32 )(59 2x+30.9=24.9,)(52)(X60()=1.3 3 53()2.9x=,5.3x :,)4)X+0.5:=2(X(61()=1.5)2.8x()54(7,0.05=3.528 X62()6=80,4(63)2X)72(3X=6.38,(64)44.5 ),(73 )(654X7.2=10,=,+x)(74)4(66)11.5X+X=20,x=,750.25+)()3.812+15X=87.6,(67 ,(76)x(68,)6X+5=17 (69=4.2,)

4、()0.62.5+X 6=x,:(77)200:=X70():X=)4,78,()x+7,()()(798x2=2()71,(88)3(x+4.5)=60,18%=:(80,)(89)1.6x+2.4=7.52,2x=,)(81 (90)3(x0.8)=6.3,x=46x+82()5x=5.8,91)28.4(:83():,x=(92)x:=,(84),(93+2x=)3x585()(1)2x=51x24)()()x=15%94(,(=,)86 ,95()xx=8)87(X+13(=5)72X),x+50%x=6,(96),104)x():x=0.312,(97:,)x(105 =26,)4x

5、+2(8x(98 (106)5x+35=650,x,=0(99)(107)720 3x=80,100()+x=1 (108)3.6x 0.9x=8.1,=,x101()(+),3x=6109()44.5 (102,),=(110 (,)103 ,1.8X=7.236111()(120)22.50.4x=12.5,),(112x=2,3.5=4:(121)x ,(113)x=42 (122)x0.8x6=16,(114),x+=:=x:8),(123 7x115(),3=8.19 )0.6=x116()12:,(124 ,x+1=4x+23117()()(),:(125)x:15=(118)3x

6、,70%x=9.2,x+x=(126)x=5,),(119)6+x=240(127x50%(136)7x3=8.19,x=,)1(128 (137)32.89x=17.5,2.5+1,129)x=3((138)x0.36x=16,2=4)(130,3x (139)67+3x=69,)(1318.53x=2 (140)6x+2x56=0,)3x=4,132(,5%=17.54x(133)(141)3x0.454=2.7,(142)5.8x4.6x=0.96 x4:=)(134:(),=3x9(143)8.4(),(135)6x+31=49 (144)3x1.2=8,(153)7.83x=3.6,

7、(154(145)5x+28=71,)631.8x=7.2,(155)10:,x=4.5:0.8,8.7(146)1.2x=3.9 ,8x)2.6x=37.8(147:,156=x):(4=8.50.75x(148)0.95,7.65=4.64,157)X(54,2+3x=72)(149,28.25 )X=8.25(158 =12.42),2.6=37.88x150(),159)X(3.6+2.97(151(=,)x x=160(,)(152,x+30%x=26 ,14.5=5.5(161),x80%x=48(162)x=,5(171)=675%x(163)5,x=,172()x,6.8=15

8、.4(164 3x=1.5,4.5173)(,1.9x=5.7(165)x=0.5,1+25%174)()(y=4.6166()4.3y,40%x=9,)x(175 ,5x+2.6=7.6167(),20%=15.2176()x ,(168)x1.5=12.9 ,(178x)x=,(169)9x+5x=8.4 ,(170)6.8+3.2x=14.8,75%=3x(179)4x,(180=1188,)(4.5:),x=(181:(189)4x56=12,6=12.5,(182)(x4.5)(190)8x3x=15.6,17x=13.4(183)27,(191)30(x 4)=60,)(1849.

9、6+3x=3.245 3x=1.2,7.20.5(192)185(),72x+5=5x 5=8,(193)5x2.4 ,2x5=22x(186)3()()2(194),+x=(4x)1873+4=0)20 x,(,15=665x+2.4195()(196)3.2x+2.8x-x=1,197)2.516-8x=12(,198()9.6-3x=6.3 x+6,)=75)(1995(,3=4x200()0.7+0.9 题解方程专项练习 200 答案:)x(,)(x)1(x=6 )x,(1)x=,1=6(=16,6x=,6x3=1,6x=4,6x6=46,;x=x=x=1.2,=,(9)2x(2)x

10、)=1.2x=,x(2 x=1.2,x2121=,x=12;,x=1.2 x=1;4x=,(3)(10)931.7x=13.4,4x+4x=,+4x 271.7x=13.4,271.7x+1.7x=13.4+1.7x,=+4x 13.4+1.7x=27,13.4+1.7x13.4=2713.4,4=4x4,1.7x=13.6,1.7x1.7=13.61.7,x=x=8 (11)x2x=13.6 84()2.525%x=24,75%x=24,202x=13.6 75%x75%=2475%,13.6+2X=20,x=32;,2X=6.4 x=3.2;,5x=3 0.78)5(:+0.2=,(12x

11、)3x=0.78,5 ,3x=3.90.6=,x x=1.3 6(,20%x=0.41)0.6+0.6=+0.6,x 1,20%x+20%x=0.4+20%x 0.4+20%x=1,x=,0.4+20%x,0.4=10.4 ,20%x=0.6,x=0.6 20%x,x=1 ;x=3 1)8()x(=6,0.6x+90%x=78)13(1.5x=78,)x+0.8=5.6,(20 1.5,1.5=78 1.5x ;x=52x+0.80.8=5.60.8,2.4)20%x3=0.8,(14x=4.8,7.2=0.8,20%x ,20%x7.2+7.2=0.8+7.2,=4.8x 20%,20%x2

12、0%=8 x=8 x=40;(21)1.4:x=1:0.75,x=1.40.75,15,)xx=42(x=1.05 )=24,(22)xx=42,(2 =24,x x=42,x=252 ,=24 x 2.5=67.5,(16)0.6x+3 x=20;0.6x+7.5=67.5,0.6x+7.57.5=67.57.5=3,(23)4x ,0.6x=60 0.6=600.6,0.6x+,+4x=3 x=100;4x=4,4x4=44,x=1 =5,(17)1x0.45)(24)12x+70.3=20.1,12x+2.1=20.1,0.45)(x0.45x0.45x=(),2.1 12x+2.12.

13、1=20.1 ,12x12=1812 x2.4=1.6,;x=1.5 x=25(x+)2.4+2.4=1.6+2.4x,x=x=4,x,x=4,x=;x=x:42=,)(26 2.25=8.25,x)18(2.25+2.25=8.25+2.25 x,10 x=42,;x=10.5 ,10 10 x10=30 19(:x=3):,12 x=3 12,3x=3x33=9,x=0.5+)27(x=3 x3+3=2.9+3,0.75+x=3.75 x=5.9;(34)1.6x=6.4,0.75+x0.75=3.750.75,1.6x1.6=6.41.6,x=4;x=3,(35)4x39=29,4x27

14、=29,x=3,4x27+27=29+27,4x=56,x=6;4x4=564,x=14;x,:=0.4828()0.8:(36)16+8x=40,16+8x16=4016,0.8x=0.48,8x=24,8x8=248 0.8x=0.2,x=3;,0.8x0.8=0.20.8 (37)x1.1=3,x=x1.11.1=31.1,x=3.3 ,(29)=+2x=,(38)x=,=,+2x x,=2x=,x=3;2=2,2x 4230():=:x=;x=42,)37x=1.04(39,x=30,2.167x=1.04,2.167x;x=50 1.04=1.041.04,7x=0,1.12 7 0

15、.4=75%5x)31(,7x7=1.12,0.4+0.4=75%+0.4 5x x=0.16;,55=1.15 5x,x=2(40)x1 x=0.23 ,1=2x ,0.9=4.5(32)6x 1+1=2+1,x,0.9+0.9=4.5+0.9 6x ,6x=5.4,x=3 66=5.4 6x,;x=0.9=3x,x(2)(33,=5.8;x=18)3 2 2=5.83x(2),x=14x)41(,3=2.9 x x=1 x=14,25%X+25%x=+25%x,1(x48=14,)0.25x+0.250.25=1;x=18 0.25,0.25x=0.75,x=(42)3x x=3;,=x=

16、,)(49 0.25x=1.251.6,x=,0.25x0.25=1.251.60.25,x=8;x=;,X=)50(),=(43 =,X ,2.4x=720.26 2.4x=18.72,x=;2.4,2.4x2.4=18.72,:3251)5;x=7.8:8=x(,32 8x=5,:=)(441.2 8,328=58x x=20 5,x=1.2 0.9=24.9,52)2x+3(2x+2.7=24.9,x=6,2.7,2.7=24.9 2x+2.7 2,2=22.2 2x=6x,x=11.1;x=9;,2.9x=(53)5.3x =:,(45),2.4x=,x=18 ,2.4x2.42.4=

17、x=,;x=,x=1.5,7(2.8x(54)x=12;),(72.8x=1.50.8=x:46():,2.8x=2.1,7 x=0.8,72.8x+2.8x=2.1+2.8x 2.12.1=2.1+2.8x,7 x=0.04,2.8,2.8=2.8x 4.9 ;x=0.2;x=1.75 (47,:,+1=x)(55x0.3=:,x=0.3,=x 2X24+24=80+24,x,=2X=104,2X2=1042,x=X=52;(64)44.53X=6.38,(56)150%x+66=99 183X=6.38,1.5x+66=99 183X+3X=6.38+3X 1.5x=33,6.38+3X=

18、18 x=22,6.38+3X6.38=18)x+60.8x=16 6.38,(57 3X=11.62,0.2x+6=16 3X3=11.623,0.2x=10 x=50 X=;()65)4X(587.2=10,4X7.2+7.2=10+7.2,4X=17.2,4X4=17.2 x=14.4 4,X=4.3;(66)(5911.5X+X=20),12.5X=20,0.55x=5.5 12.5X x=10 12.5=2012.5,X=1.6;=1.3 (603()X)(67)3.812+15X=87.6,45.6+15X=87.6,=1.3)(),xxX3()(45.6,45.6=87.645.

19、6+15X ,15X=42 0.78=1.3x 3,15=4215,15X X=2.8 ,3+0.78=1.3x0.78+0.78)6X+5=17,(68 5,6x+55=17 4.68=1.3x,6,6x6=12,4.681.3=1.3x1.3 ;x=2;x=3.6 )(61()X+0.5:2,:4X=(),(2.5+X)=4.20.6(69),0.6=4.20.6(0.62.5+X)=)4x(,x+0.5)2.5+x=7,2.5,2.5+x2.5=7 x+x4=0.5,x=4.5;x=10 xx+,x :(70,):=X 2.25x10+10=0.125+10,2.25x2.25=10.1

20、252.25,x=x=4.5 X62()0.05=3.528,x,=,0.050.05=3.5280.05X x=0.6;X=0.1764 6=8042X)63(,24=80 2X ,(71),x=,;:,6=x(77)200:72)(,6x=200 ,6x6=4806,x=80 ,X=,(78)4 X=X,X 4 X=4;,(73),=4X X=10;,(79)8(x2)=2(x+7),8X16=2X+14 ,16=14 6X ,6X=30 ;X=5)(+x=,474()18%=):,(,+4x=80 =6.5,X=0.18+4x ,4x=4 X=1.17,;x=1 X=7.8 (75),x

21、=0.25+2x=,x=,0.2+)(81 x 0.2+0.2=2x+2x=+2x,0.2 +2x=,x=+2x x=,2x=,x)76(x=2 2x,2=(87)8(2X7)=5(X+13),x=;16x56=5x+65,16x565x=5x+655x,x+x=46 11x56=65),(82 11x56+56=65+56,=46 x,()+11x=121,11x11=12111,x=46,x=11,=46x(88)3(x+4.5)=60,3(x+4.5)3=603,;x=40 x+4.5=20,x+4.54.5=204.5,:x=83(,):x=15.5 (89)1.6x+2.4=7.52

22、,x=1.6x+2.42.4=7.522.4,1.6x=5.12,x=1.6x1.6=5.121.6,x=3.2;=,x (90)3(x0.8)=6.3,;x=3x2.4=6.3,3x2.4+2.4=6.3+2.4,3x=8.7,=,(84)3x3=8.73,x=2.9;2 1.6x=6.4,1.6x=12.8,(91)28.4 1.61.6=12.81.6x,5x=5.8,28.4 x=8 5x+5x=5.8+5x,5.8+5x=28.4,5.8+5x5.8=28.45.8,)()()4()(8553x2x1=52x1 5x=22.6,52x+2=10 x20 15x,5x5=22.65,1

23、3x18=10 x5 x=4.52 10 x510 x=10 x18 13x,518=3x 18+18=5+18,3x=(92)x:3x=13,3x3,3=13,3 25x=;x=25x=,86=),(25=,25x 6x 3()1,=64 18x,3=64 x=;3+3=64+3 18x,18x=67,1818=67 18x +x=1,(,100(93)+2x=,=1+x+2x=,2x=0,x=,x=0;)x=15%,=x(94 x=1;xx=15%x,=,+(101)x)(,0.15x=0.15 0.15,0.15=0.150.15xx=,x=1;,x=,=x(95x)x=x=,),102

24、 x(=,x=,x+50%x=6),(96 ,1.5x=63=,3x,1.5=6 1.5x1.5 ;x=4;x=x=0.3,:12(97:)(103,),0.3x=,0.3=90.3,0.3x ;x=30,)()(984x+28x=26,x=20;2x=26 4x+16,2x+16=26)(104x,16=26 2x+1616,2=10 2x2,x=5 ,x)(99=0,x=,+x=0+;,(,x=105)x 3=x,3x,;x=x=,5x+35=650)106(5x+3535=65035,5x=615,=,)(114x+,5x5=6155 x=123;,=x+,3x=80(107)720 7

25、203x3x=803x,x=240 x=720,240=720240 240 x,=x x=3;3.6x(108)0.9x=8.1,x=)x=8.1,(3.60.9(115)2.7x=8.1,7x3=8.19,7x33=8.19 2.7x2.7=8.12.7,3,7x=24.57 x=3;,7x7=24.57 7,x=3.51;,3x=6 (109)44.5 18,3x=6:,0.6=x 116)12:(183x+3x=6+3x,6+3x=18,0.6x=12 6,6+3x6=18 0.6x=6 3x=12,0.6x0.6=60.6,3x3=123,x=10;x=4 ,(110)=(117)3

26、(x+2)=4(x+1),3x+6=4x+4,0.8,2.5x=10 3x+62.5,3x=4x+4 3x,2.5=8 2.5x x+4=6;x=3.2,x+44=64,x=2 1.8X=7.2,36111()181.8X=7.2,1.8X+1.8X=7.2+1.8X,18(118)3x,7.2+1.8X=18 70%x=9.2,3x7.27.2=18 7.2+1.8X0.7x=9.2,2.3x=9.2,1.8X=10.8,2.3x1.81.8=10.8 1.8X,2.3=9.22.3,;X=6 x=4 112(),x=,(119)6+x=240 ,6,x=6+x6=240 x=234;x=,

27、=234,x x)113(=42,x=390 ,120)22.50.4x=12.5(,x=42,0.4x+0.4x=12.5+0.4x 22.5,12.5+0.4x=22.5;x=9 12.5+0.4x12.5=22.512.5,x=30;,0.4x0.4=100.4x=,1(128)x=25;+xx=1,x+:(121)x:3.5=4 2,+x=1 2x=3.54,=1,+x2,2x2=14 x=6 ,=x 6=16,(122)x0.8x 0.2x6=16,x=;,0.2x6+6=16+6 ,0.2=220.2 0.2xx=3,2.5+1(129);x=110 2.5=32.5,):=x:8

28、,2.5+1x123(,x=8,x=8,=,xx x=4;x=,2(130 124(),)=43x 0.06x=20.015,=4+2 3x2,+2 0.06,0.06=0.03 0.06x ;x=0.5 x=6,3 x,:15=:(125)33=6x 3,x=15 x=;66=15x,8.5,3x=2131()x=40;,x=(126)x+3x+3x=2+3x 8.5 x=,3x+2=8.5,22=8.5,3x+2=x 3x=6,;x=,3=63 3x x=2;50%x)127(x=5,132)3x=4(x=5,xx=4x 3 6=5x6,42+3x=69,4x=3,42+3x42=6942

29、,3x=27,4x4=34,3x3=273,x=9;x=(140)6x+2x56=0,(6+2)x56+56=0+56,x5%=17.54133(,)8x=56,8x8=568,解:x5%+5%=17.54+5%,x=7 (141)3x0.454=2.7,x,=17.59 3x1.8=2.7,3x1.8+1.8=2.7+1.8,;x=23 3x=4.5,3x3=4.53,(134),:=:(4x)x=1.5;(142)5.8x4.6x=0.96,x=解:,4 1.2x=0.96,1.2x1.2=0.961.2,x=x 2,x+x=0.8;(143)8.4(9x)=3,x,+2,3 9x=8.4

30、 x=2.8,9=,x 2.8,x=9 ;x=6.2 x=3,(144)3x1.2=8,1.2=8,(135)6x+31=49 1.2 3x1.2,3x=9.6 31=49 6x+3131,3=9.6,6x=18 3 3x x=3.2 6=18 6x 6,);x=3 1455x+28=71,((136)7x28,3=8.19,5x+2828=71 7x33=8.19 5x=43,3 5,5=43 7x=24.57,5x x=8.6;,7=24.57 7x7 x=3.51;1.2x=3.9,146,(137)32.89x=17.5)8.7(,9x+9x=17.5+9x 32.83.9=3.9+1

31、.2x3.98.71.2x+1.2x,17.5+9x=32.8 4.8=1.2x,1.2x=4.8 17.517.5=32.817.5+9x,1.2,1.2x1.2=4.8,9x=15.3 x=4;,99=15.3 9x,147)8x;x=1.72.6x=37.8(5.4x=37.8,0.36x=16(138)x ,x=16)0.361(5.4,5.4x5.4=37.8 ,0.64x=16 x=7;0.640.64=160.64x,4=8.50.95;x=250.75x148(),3.8=8.5 0.75x,7+3x=69(139)6 0.75x3.8+3.8=8.5+3.8,4.5x=8,4

32、.5x4.5=8 0.75x=12.3,4.5,0.75,0.75x0.75=12.3 x=;x=16.4,(149)542+3x=72:,:(156=x)27+3x=72,27,27+3x27=72 x=,3x=45 ,3x3=453,x=x=15;,x=2.6=37.8,8x(150)8x2.6+2.6=37.8+2.6,x=8x=40.4,(157)8x8=40.48,X7.65=4.64,X7.65+8.67=4.64+7.65 x=5.05,X=12.29;(158)28.25X=8.25,=,(151)x 28.25X+X=8.25+X,X+8.25=28.25,x,=X+8.25

33、8.25=28.258.25,X=20;x=,(159)X(3.6+2.97)=12.42,X6.57=12.42,x4=,4 X6.57+6.57=12.42+6.57,X=18.99 ;x=,160(x=)152(),x+30%x=26 )(1+30%x=26,xxx=,1.3x=26 1.3x1.3=261.3,x=x=20;3x=3.6,7.8153(),=x 7.83x+3x=3.6+3x,3.6+3x=7.8 x=,3.6+3x3.6=7.8,3.6 3x=4.2,;x=3x3,3=4.2 x=1.4 14.5=5.5,(161)3 6)154(1.8x=7.2,1.8x=7.2,

34、18 14.5+14.5=5.5+14.5,18,1.8x+1.8x=7.2+1.8x 18=7.2+1.8x,=20 7.2=7.2+1.8x 18,7.2 ,10.8=1.8x,8=208 1.8=1.8x 10.8,1.8 x=160 ;x=6 ,0.8:x=4.5:10155(),80%x=48x)162(,0.8 4.5x=10 x=48,(10.8),=5x 0.2x=48,0.2x0.2=480.2 x=;x=240 x=,)(172 (163)75%x=65,+x,x=x+0.75x3=6,3+3=6+3,0.75x,+x=0.75x=9,0.750.75=9,0.75x,+x

35、=x=12 (164)x6.8=15.4,=x x6.8+6.8=15.4+6.8,;x=22.2,=x ;,(165)1.9x=5.7 x=1 1.9,1.9=5.71.9x x=3;,4.53x=1.5(173),y=4.64.3y(166),3.5x=1.5 1.5,3.3y=4.6,3.5x+3.5x=1.5+3.5x 1.5 1.5=1.5+3.5x3.3 3.3y3.3=4.6,1.5,1.51.5=1.5+3.5x y=;,0=3.5x,3.5=3.5x3.5 167()5x+2.6=7.6,0 x=0 5x+2.62.6=7.62.6,1+25%)5x=5,x=0.5(174)

36、(,5x5=55 1.25x=0.5 1.25 x=1 ,1.25x1.25=0.5(168)x x=0.4;,1.5=12.9,1.51.5+1.5=12.9 x x=11.440%x=9,(175)x;0.6x=9,(169)9x+5x=8.4,0.6,0.6x,14x=8.4 0.6=9 1414=8.4 14x,x=15;x=0.6 ,(170)6.8+3.2x=14.8,)x20%=15.2(176 20%20%=15.2,x,6.86.86.8+3.2x=14.8 20%x=76 3.2x=8,30=180,(177,3.2=8 3.2x3.2)30 x 30+30=180+30,

37、30 x x=2.5 ,30 x=210)171(,x=5 3030=210,30 x x=7;xx=,x 5 x=,x(178)=5,x x=,3x3=6.63,=x x=2.2 (185)2x+5=5x7,;x=2x+52x=5x72x,3x7=5,3x7+7=5+7,75%=3,)x(179 3x=12,3x3=123,x75%75%=375%x=4;(186)3(x2)=25(x2),x=3x6=125x,3x6+5x=125x+5x,x=8x6=12,8x6+6=12+6,x=8x=18,8x8=188,(180)4x x=2.25;6=2.4,4x(187)4x3(20 4x=2.

38、4+6,x)+4=0,7x56=0,x=8.44,7x56+56=0+56,x=2.1 7x=56,(181)x=:4.5,7x7=567,x=8;x=4.5,x=2,=1188,)(,x=2)24=124,(6(y+2)4(2y x=5 3)=24,302y=24,302y+2y=24+2y,6=12.54.5x()(182),2y+24=30,6x4.56=12.5 2y+24 27=12.5 6x,24=3024,6x27+27=12.5+27 2y=6,2y2=62,6x=39.5 ,66=39.5 6x y=3 6=12,4x(189)5;x=6,4x30=12 17x=13.427

39、183(),4x30+30=12+30 ,2717x+17x=13.4+17x 4x=42,4=42,4 13.4+17x=27,4x;,13.413.4+17x13.4=27 x=10.5,17x=13.6 3x=15.6190()8x,1717=13.6 17x,x=0.8;5x=15.6,55=15.6 5x 59.6+3x=3.24)184(,9.6=16.2 9.6+3x x=3.12,9.6;,3x=6.6(191)30(x4)=60,6.3+3x=9.6,6.3+3x-6.3=9.6-6.3,30,30(x4)30=60 3x=3.3,x4=2,3x3=3.3,3,x44=24

40、x=1.1;x=8;(199)5(x+6)=75,5x+30=75,(192)7.20.53x=1.25x+30-30=75-303x=1.2 3.6,5x=45,3x+3x=1.2+3x,3.65x 3x+1.2=3.6,5=455,x=9,3x+1.21.2=3.61.2;(200)x 3x=2.4,0.7+0.93=4,x 3x3=2.43,0.7+2.7=4,x0.7+2.7-2.7=4-2.7 x=0.8,x0.7=1.3,x0.7 5=8,0.7=1.30.7,2.45x193()x=0.91 5x12+12=8+12,5x=20 5x,5=205 x=4,+x=2(194)x=,=,x x=(15=66,5x+2.4195),5x+36=66,5x+36-36=66-36 5x=30,5x55=30,;x=6)1963.2x+2.8x-x=1,(5x=1,5=1 5x5,x=0.2;(16-8x=122.5197),40-8x=12,40-8x+8x=12+8x,8x+12=40 8x+12-12=40-12,8x=28,88=28 8x,x=3.5 198(,9.6-3x=6.3),9.6-3x+3x=6.3+3x

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