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1、班级用时：78+4=4+()62+37=37+()33+35=( )+3343+85=()+436+(8+7)二()+8+76+(5+3)=()+5+35+(8+4)=5+( )+43+(6+4)= 3+( )+48+9+2=8+(+2)7+5+2=7+(+2) (9+5)+7=9+(+7) ()+77=77+11()+(7+4)=3+7+4()+(2+7)=5+2+7()+8+9=3+(8+9)()+(3+4)=9+3+49+( )=44+974+( )=94+743+7+()=3+(7+2)3+(+7)=3+8+73+57=57+()53+62=( )+5378+89=( )+784+5+
2、7=()+(5+7)7+2+5=( )+(2+5)8+(7+9)=8+7+()5+9+6=()+(9+6)4+8+7=()+(8+7)4+7+9=4+(7+)4+7+8=4+(7+)()+89=89+36()+92=92+32()+4+2 = 7+(4+2)()+8+3=7+(8+3)()+2+5 = 3+(2+5)(+6)+5=4+(6+5)25+( )=99+2599+()=75+993+9+()=3+(9+5)7+(8+)=7+8+989+61=61+()26+99=99+()93+78=78+() 8+(7+4)= 8+( )+46+3+9=()+(3+9)7+(5+2)= 7+5+(
3、)4+(3+7)=( )+3+72+6+4=2+(6+) 4+2+7=4+(2+) (3+9)+4=3+(9+) ()+39=39+83()+2+5=9+(2+5)()+(3+6)=7+3+6()+(3+7)=6+3+7()+5+9 = 6+(5+9)(+5)+4=8+(5+4)13+( )=32+1352+( )=67+528+( )+9 = 8+(5+9)3+(5+)=3+5+2姓名：得分: 口算练习-乘法分配律总题数：100题班级：用时：7x45 + 3x45 0 10x45 36x7+36x3 0 36x102x98+8x98C 10x98 4x78 + 6x78 0 10x78 23
4、x7+23x3 0 23x10 41x2+41x8 041x(2 + 8) 45x6+45x4 0 45x(6+4) 72x6+72x4 0 72x(6+4) 44x7+44x3 0 44x(7+3) 9x63+9x37 0 9x(63+37) 78x6+78x4 O 78x10 68x3+32x30 100x3 41x4+41x6 0 41x10 6x11+4x110 10x11 96x7+96x3 O 96x10 97x2 + 97x8 0 97x(2 + 8) 86x4+86x6 0 86x(4+6) 97x2+97x8 O 97x(2+8) 9x55+9x45 0 9x(55+45)
5、2x67+2x33 0 2x(67 + 33)53x2x5=2x81x5=6x4x25=59x5x2=3x4x25=47x9+47=99+9x99=9x32+32=620-5-2=370+5+2=520-2-5=4x8x125=38+99x38=41+41x99=71+71x99=550cH25二 2900-4-25=90001258=4000-8-125= 30001258=2x4x25=2x14x5=8x4x25=60-5-2=4x7x25=9x71+71=9x23+23=9x54+54二280+2+5=8x4x125=370+2+5二930:5:2二9x8x125=99x65+65=52
6、x99+52=6500:25:4二5300-4-25=5300-25-4=5000-8-125=7000-8-125=4x4x25 =15x5x2=9x25x4=49x2x5=48x2x5=5x73x2=94+9x94=9x76+76=6x8x125=870g5二125x3x8=460+2+5=8x6x125=99x75+乃二31+31x99=700-4-25=4900:4:25二5200:4:25二20008125=2000-1258=m 用时：6x25x4=4x2x25=2x42x5=76x2x5=4x6x25=9x19+19=9x42+42=4x125x8=3x8x125=730-5-2
7、=125x2x8=2x125x8=99x95+95=37+99x37=99+99x99=4100+25+4=4500-4-25=8000:125:8二3000-8-125=5000-1258=彳盼：算练习-乘法简便计算总题数：100题引吸 用时：14x12-2x14=18x97-97x8=12x67-2x67=83x15-5x83=14x96-96x4=53x16-6x53=16x62-62x6=97x15-5x97=28x18-8x28=13x32-32x3=16x99-99x6=17x93-93x7=66x17-7x66=16x72-6x72=14x33-4x33=46x16-46x6=1
8、5x74-74x5=18x92-92x8=16x22-6x22=93x12-2x93=m用时：73+18+2=14+77+6=25x3x4=54x5x2二2x38x5=35x5x2=69x2x5=9x54+54=14+9x14=142-97-3=19+26+51=54+19+16=15+26+55二340:5:2二8x9x125=720:2:5二660:2:5二76+99x76=89+89x99=137-67-33=7+5+53=28+56+2=48+35+5=14x5x2=25x9x4=2x89x5二5x28x2=9x32+32=76x9+76=19+9x19=141-93-7=25+37+
9、25=14+27+33=92035+2=870:5:2二910:5:2二2102+5=77+99x77=99x32+32=52+52x99=用时：149-64-36=131-79-21=105-56-44=111-87-13=3+90+37+10=20+6+80+64=6100:25:4二108-15-5-80=78+60+12+40=25+90+35+10=40+25+60+65二79x19-9x79=64x19-64x9=88x16-6x88=19x76-76x9=86x15-5x86=124-35-45-20=103-25-25-50=118-30-20-50=124-40-10-50=
10、班级:113-50-50=111-46-54=134-43-57=60+6+4+40=20+76+80+4=9300+425=109-25-5-70=14+90+66+10=42+18+10+90=35+40+25+60=4000:125:8二34x12-2x34=58x15-5x58=16x12-6x12=31x19-31x9=13x43-43x3=115-30-20-50=138-40-30-30=117-35-35-30=121-35-35-30=用时：3+9+5=3+(9+)(6+9)+3=6+(9+)28x125=20x125+8x()()+7+2=9+(7+2)7+(3+)=7+3
11、+575+94 C 94+7570+170 17+70(39x5)x2 C 39x(5x2)(87x8)x125 C 87x(8x125)(30x125)x8。30x(125x8)班级:7+6+8=7+(6+)(4 + 25)x4=4x4 + ( )x488x125=( )x125+8x1254+6+( )=4+(6+7)9+(2+)=9+2+561+600 60+6193x610 61x93(49x4)x25 049x(4x25)(67x8)x125 O 67x(8x125)(49x8)x125 049x(8x125)4.8 O 4.62.2 O 1.95.3 O 6.55.8 O 5.34
12、.7 O 5.39.2 O 8.46.3 O 5.91.5 O 1.94.13 O 4.314.54 O 4.450.29 O 0.924.9 O 4.9589.32 O 9.239.81 O 9.186.93 O 6.3963.815 O 3.829.267 O 9.219.17 O 9.7155.89 O 5.8360.35 O 0.3466.7 O 7.51.5 O 0.30.9 O 1.31.6 O 1.45.4 O 4.30.8 O 0.36.1 O 6.45.5 O 4.65.42 O 5.241.118 O 1.13.9 O 3.9373.2 O 3.2038.509 O 8.5
13、3.76 O 3.679.49 O 9.4862.19 O 2.1589.71 O 9.1751.014 O 1.040.128 O 0.133.299 O 3.92购：用时:6.6 O 6.26.3 O 5.97.8 O 7.60.5 O 0.92.4 O 3.17.3 O 7.95.7 O 5.59.2 O 8.44.956 O 4.91.38 O 1.830.23 O 0.322.98 O 2.890.29 O 0.922.3 O 2.3394.92 O 4.2939.52 O 9.2536.753 O 6.763.98 O 3.9797.86 O 7.8222.81 O 2.8735.
14、8 O 5.51.3 O 2.65.2 O 5.72.7 O 2.87.5 O 6.48.6 O 8.53.8 O 2.64.4 O 4.14.23 O 4.327.37 O 7.731.29 O 1.928.302 O 8.33.9 O 3.9938.58 O 8.854.62 O 4.2647.28 O 7.8282.73 O 2.7793.928 O 3.998.93 O 8.9768.86 O 8.8582.3 O 2.76.9 O 6.77.5 O 7.27.5 O 6.99.9 O 9.51.9 O 0.95.8 O 6.74.5 O 3.40.16 O 0.618.38 O 8.
15、831.4 O 1.4151.58 O 1.855.56 O 5.656.25 O 6.524.124 O 4.113.831 O 3.384.635 O 4.640.51 O 0.5041.506 O 1.510.756 O 0.57口算练习-小数点位置移动引起小数大小的变化总题数：100题购:94-10=133-10=31510=0.29x10=53.2-10=3.15x10=58.7x10=9.93x10=73.4-10=44.9:10二217-100=94-1000=474-100=734-100=2.62x100=0.953x10=0.505x10=114-1000=763-1000
16、=5.74x1000=24-10=54-100=91-100=4.87x10=9.91x10=66.9-10=32.2-10=38.8x10=83.5:10 二573:100=927-100=934-100=515-100=559:100二0.176x10=6.27x100=9.65x100=172-1000=403-1000=9.25x1000=用时：524-10=91-100=801-10=53.5:10 二11.8-10=29.2x10=72.4-10=4.06x10=52.6x10=676:100二876100=581-100=331-100=665:100二3.94x100=9.82
17、x100=0.398x10=2781000=987-1000=0.591x100=373:10二921-10=91.8x10=44.9:10 二2.75x10=6.95x10=3.1x100=43.710 二95.9-10=990:100二425-100=785:100二149-100=0.975x10=0.975x10=0.233x10=1261000=352-1000=272-1000=0.174x100=口算练习-小数点位置移动引起小数大小的变化 总题数：100题6.79x1000=0.905x100=0.338x1000=0.397x10000=0.815x10000=6.36x100
18、0=2.36x1000=0.528x1000=0.828x10000=0.093x10000=班级7.36x1000=0.442x1000=0.899x10000=0.917x10000=0.195x10000=用时:0.586x100=0.488x1000=0.202x10000=0.513x10000=0.532x10000=算练习-小数的改写 总题数：100题7.4t = ( )kg 23kg = ( )g 310kg = ( )t 2.18t = ( )kg 3.32t = ( )kg 2t20kg = ( )t 85dm = ( )m 6.63kg = ( )g 7.58kg = (
19、 )g 9930kg = ( )t 1370kg = ( )t 1.5m = ( )dm 5080g = ( )kg 1670g = ( )kg 760cm = ( )m 805dm = ( )m 775dm = ( )m 9.44m = ( )cm 725cm = ( )dm 123cm = ( )dm 72()kg 0.6kg = ( )g 4.44t = ( )kg 8.58t =()kg 0.38t = ( )kg 6t40kg = ( )t 72dm = ( )m 0.14kg = ( )g 9.39kg = ( )g 5690kg = ( )t 9.2m = ( )dm 9.3m
20、= ( )dm 2080g = ( )kg 830cm = ( )m 477dm = ( )m 868dm = ( )m 9.31m = ( )cm 0.53km = ( )m 558cm = ( )dm 294cm = ( )dm8.2kg = ( )g2.2kg = ( )g 0.33t = ( )kg 335t 二()kg 433t = ( )kg 5t60kg = ( )t 2.21kg = ( )g 5.18kg = ( )g 2450kg = ( )t 1150kg = ( )t 3.5m = ( )dm 5.3m = ( )dm 2150g = ( )kg 6t570kg 二()
21、t 294dm = ( )m 392dm = ( )m 2.49m = ( )cm 0.21km = ( )m 849cm = ( )dm 7890m = ( )km3+(5+)=3+5+47+(+9)=7+4+9(2+4)+( )=2+(4+6)(8+)+4=8+(7+4)50+31 O 31+5085+86O 86+8589+30 C 30+89 9+5+2。9+(5+2) 5+8+40 5+(8+4)9+(6+2) 0 9+6+2 (7+5)4-20 7+(5+2)(6+5)+8 O 6+(5+8) (3+7)+2。3+(7+2)(3+8)+5。3+(8+5)7+(+6)=7+5+6 (
22、4+5)+()=4+(5+6) (4+)+9 = 4+(7+9) 62+6 0 6+6237+88 O 88+3771+80 O 80+7175+70 0 70+75 4+5+3 04+(5+3) 3+(4+6) O 3+4+6 2+4+3 0 2+(4+3) (2+7)+3 0 2+(7+3) (2+6)+8 0 2+(6+8) (3+2)+7O3+(2+7)班级用时：2+(6+)=2+6+5(4+8)+( )=4+(8+5)(5+)+6 = 5+(3+6) 20+14 0 14+2016+40 O 40+1680+23 O 23+804+7+5 O 4+(7+5)2+(8+4) 0 2+8
23、+4 4+(9+3) 0 4+9+3 9+(8+2) 0 9+8+2 (3+5)+8。3+(5+8) (2+6)+9 0 2+(6+9) (3+8)+5 0 3+(8+5)算练习-小数的改写 总题数：100题9920m = ( )km3430m = ( )km 8m75cm = ( )m 797dm2 = ( )m2 0.51m2 = ( )dm2 101cm2 = ( )dm2 6.78dm2 = ( )cm2 6.6m O 667cm1.3m O 135cm571g O 0.571kg0.898kg C 898g996cm C 9.95m 0.544km O 544m0.187km O 1
24、87m购：用时：3610m = ( )km 6m63cm = ( )m 5m47cm = ( )m 333dm2 = ( )m2 4.98m2 = ( )dm2 2km90m = ( )km 8km780m = ( )km 825cm O 8.2m 73m O 739cm 0.865kg O 865g 0.119kg C 119g 415cm O 4.14m 118m O 0.118km2140m = ( )km 8m91cm = ( )m 525dm2 = ( )m2 1.9dm2 = ( )cm2 1.67m2 = ( )dm2 4.78dm2 = ( )cm2 7.9m O 797cm
25、9.3m O 937cm 6.7m O 672cm 0.743kg O 743g 0.793kg C 793g 5.45m O 544cm 0.368km O 368m班级用时：276-10=16.3x10=0.99x10=251-100=9.46x100=8.67x100=260-1000=0.459x100=7.68x1000= 0.599x10000=0.85t = ( )kg736kg = ( )g7.2 m = ( )dm4dm2 = ( )m2 2t720kg = ( )t 960cm = ( )m 6tl40kg = ( )t 488dm = ( )m 6m54cm = ( )m
26、 648cm2 = ( )dm2391-10=805:10二 6.88x10=60.4-10= 914-100=4.59x100=141-1000=699-1000= 0.05x1000= 0.489x100=6.4t = ( )kg8.36t = ( )kg 4.71kg = ( )g 2.6m = ( )dm 2980g = ( )kg 270cm = ( )m6t580kg =()t 5t720kg = ( )t5.91km = ( )m 5m59cm = ( )m321-10=747-10=3.54x10=49.5-10=968:100=0.718x10=585-1000=892-10
27、00=9.97x1000=0.653x1000=5.8kg = ( )g 1.66kg = ( )g9710kg 二()t5.4m = ( )dm 2130g = ( )kg 580cm = ( )m 3t210kg = ( )t 176dm = ( )m 888cm = ( )dm9.6dm2 = ( )cm2口算练习-单元综合练习 总题数：100题963cm2 = ( )dm24km20m = ( )km9.18dm2 = ( )cm2 8km250m = ( )km4.4 O 4.77.5 O 7.28.4 O 8.77.65 O 7.560.183 O 0.135.069 O 5.03
28、763cm O 7.6m6.2m O 629cm0.917kg C 917g776m O 0.776km班级:用时：458cm2 = ( )dm2 6km20m = ( )km 5.13dm2 = ( )cm2 7.6 0 7.49.8 O 9.34.3 O 3.45.6 O 5.54.1 O 4.1873.726 O 3.270.194 O 0.914.2 m O 423cm4.3 m O 195cm272g O 0.272kg812cm2 = ( )dm25.63dm2 = ( )cm27.35dm2 = ( )cm2 2.6 0 2.16.9 O 7.35.3 O 5.67.7 O 7.
29、7369.575 O 9.578.834 O 8.387.89 O 7.982414cm O 4.1m0.932kg O 932g0.841kg O 841g算练习-小数的加减法总题数：100题购：用时：47.8-7=6.2+31=9.9-67=75.6-2.2=0.94-0.7=87.5-1.4=6.77-4.4=69.8-6.7=71.8+4.1=80.1+6.1=5.2+0.68=9.59-7.03=9.69-5.57=2.97-2.17=7.25-1.11=6.53-1.11=2.06+7.92=0.86+9.13=0.22+9.36=6.15+2.14=78.7-4=93.2+4=3
30、.4+33=58.8-4.5=75.3-2.1=7.54-5.3=19.7-0.5=36.3+0.7=0.3+16.4=64.4+2.5=7.2+2.49=2.77-0.75=8.69-2.23=5.98-1.51=7.91-0.41=5.55-1.21=4.36+1.52=6.15+2.14=1.43+3.01=1.24+8.63=5.76-3=5.7+20=3.4+33=74.5-2.4=9.77-1.1=46.8-5.4=3.49-3.1=85.5+1.2=60.7+6.1=50.4+1.4=40.1+3.2=3.73-2.23=9.67-7.25=8.92-0.61=6.25-3.05
31、=1.31+5.08=4.13+2.05=8.34+0.34二3.23+3.24=1.17+5.32=3.7+45=5+0.45=61.7-0.2=25.9-3.3=99.8-5.7=4.91-3.9=72.4-0.3=3.13+6.6=0.45+4.4=55.2+0.8=7.2+2.49=5.89-5.81=8.94-8.11=7.25-1.11=9.86-2.35=5.11+4.51=4.11+2.61=2.03+7.11=5.31+1.56=3.43+2.36=0.5+94 二3.9+53=89.4-5.1=99.7-9.5=77.7-7.7=94.5-0.2=65.7-4.7=13.1
32、+1.7=80.5+0.2=5.5+0.08=9.99-332=9.36-1.06=8.26-6.12=8.95-7.14=9.61-2.11=6.04+0.61=1.26+1.13=7.63+1.33=1.21+8.17=2.66+3.03=口算练习-小数加减混合运算 总题数：100题8.5-8-03=7.9-77+3=2.8-03+7=11+8.8-9=21+4.6-3=6.5-63+7=6+27+0.2=11+4.4+2=7.5-(3.5-3)=8.6-11-5.5=7.5-(3.2+4)=7.9-0.3-14=53-1.2-1.1=8.9-13-4.4=6.4-41-1.1=0.2+4
33、3+0.2=6.4+11+1.2=4.7-(4.8-3.1)=5.4-(6.9-2.5)=9.6-(4.9-0.3)=8.6-3.1-3=53-0.2+4=4.4-12+4=8.6-46+2=5.6-5.4+8=5.8-23+3=15+5+0.4=4+4.7+11=4.9-13-2.6=3.9-11-2.6=6.9-13-4.1=87-7.2-0.3=7.7-(1.5+6)=8.4-(1.3+7)=21+0.4+3.4=3.1+33+3.4=2.2+31+3.2=8.1-(4.7-0.6)=5.2-(9.9-7.7)=9.5-(9.8-6.3)=姓名:班级:33+5.3-1=5.6 - 3.6
34、+5 二27+2.1-3=43+4.6-3=5.4+2.1-2 二02+1.5+6=2+1.4+41=2+53+1.6=3.8-(0.7+3)=4.8-(1.4+3)=9.9-11-3.4=3.9-11-2.6=48-2.2-1.2=87-5.6-2.1=0.2+0.4+5.3 =03+4.1+4.1=3.2+21+2.2=9.5-(9.8-6.3)=7.1-(4.6-0.5)=5.1-(9.8-5.7)= w：一用时：9.6-55+2=5.2+0.6-3=6.4+15-1=3.7+21-1=41+4.8-8=4+45+1.4=1.1+41+2=2-(5.3-4.3)=9.9-12-7.4=6
35、.4-4.1-2.2=8.9-3.5-43=8.8-17-4.1=9.9-1.4-81=3.8-(0.7+3)=72+2.2+0.2=3.1+03+2.5=9.2+03+0.4=2.1-(5.6-5.5)=8.1-(4.7-0.6)=9.5-(9.6-9.1)=班级用时:算练习-小数加减混合运算 总题数：100题7.7一(5.9一3.2)二8.7-(5.8-1.1)=9.8-(6.1+3.3)=5.7-(1.4+4.1)=8.4-(1.2+7.1)=4.5-(8.8-7.3)二63-(5.6-53)=3.8-(1.4+2.1)=4.5-(2.1+2.1)=8.4-(1.2+7.1)=9.7-(
36、7.9-5.2)二 8.6-(7.1+1.4)= 97-(2.1+73)= 5.8-(2.4+3.1)二 8.8一(7.5 + 1.2)=72-(3.9-07)= 8.9一(3.3+5.3)二 5.6-(3.1+2.3)= 7.8-(7.2+0.4)二 6.5-(5.1+1.1)=47-1.1-2.9=8.8-13-0.5=2.6-0.8-12=8.1-3.3-47=4.6+93-8.3=4.8+7.6-16=0.4+7.8 - 2.8二0.9+7.6+24=8.4+81+1.6=87+4.4+5.6=17+3.1+8.3=2.9+7.4+71=7.9+8.2+21=9.7+0.2+9.8=1
37、.9+1.3+1.14-6.7=4.4+3.6+22+0.8=1.2+21+1.9+3.8=0.2+0.3+3.8+1.7=3.3+4.1+0.9+0.7=11+2.6+6.4+1.9=7.6-53-1.7=87-5.5-0.2=67-5.1-0.9=11+7.8-6.8=77+4.2-2.2=1.5+81-3.1=23+2.4-0.4=1.4+18+8.6=6.1+9.8+3.9=7.4+7.8+26=3.6+12+6.4=6.7+4.9+51=7.9+0.7+93=0.5+3.5+6.4+1.6 二07+4.6+4.4+1.3=0.8+1.5+0.2+0.5=4.9+4.1+1.7+03=
38、4.4+13+1.6+4.7=51+1.4+4.6+0.9=0.6+42+0.8+2.4=班级：用时:8.9-4.8-2.1=9.8-1.1-27=7.1-17-5.3=8.1-0.6+15=21+3.8-1.1=47+9.1-3.7=0.9+7.6+24=9.9+6.8+3.2 二8.3+5.8+42二4.4+9.8+0.2=1.9+8.3+8.1=0.5+9.2+0.8=2.2+56+7.8=0.8+2.1+0.2+6.9=0.6+4.4+6.1+0.9=1.3+4.8+0.2+0.7 二1.2+0.7+53+2.8=2.7+0.5+13+2.5=0.7+1.8+73+1.2=0.4+1.
39、6+53+2.7=1.6+2.4+13+17=1.7+3.8+13+0.2=2.2+4.1+3.9+18=0.5+3.8+4.2+0.5=0.4+4.2+6.8+0.6=1.5+6.4+0.6+1.5 二13+4.8+0.2+0.7=6.5+3.2=( )+6.50.3+7.1=( )+0.30.4+( )=5.5+0.44.1+4.2 O 4.2+4.18.9+5.5 O 5.5+8.97.2+8.8 O 8.8+7.27.2+9.4 O 9.4+7.20.5+0.4+2.6+0.5 二1.4+1.6+32+4.8=4.7+4.1+13+0.9=5.3+07+1.1+2.9= 1.5+3.3
40、4-0.7+3.5= 5.7+0.9+1.1+43= 0.4+4.6+0.3+47= 0.2+6.3=()+0.2 ()+6.4=6.4+3.4 8.9+()=6.6+8.94.9+7.9 O 7.9+4.9 2.2+7.4 O 7.4+2.2 0.3+5.6 O 5.6+03班级：用时:0.6+4.2+0.8+2.4=1.2+4.14-1.9+4.8=0.9+0.8+1.14-0.2=0.5+1.9+1.1+3.5=1.9+6.1+0.8+0.2=3.2+47+0.3+2.8=8.6+8.8=8.8+()8.6+7.5=7.5+()()+7.8=7.8+4.97.3+( )=1.6+7.39
41、.2+6.8 O 68+9.24.6+4.2 O 4.2+4.634+4.9 O 4.9+34口算练习-单元综合练习 总题数：100题9.24-8=437-10=58.9-5.9=0.4+0.03=57.2x10=28.8x10=2x44x5=2x63x5=9x49+49=2.11+2.32 =477-1000=14x99+14=159-84-16=1.4+7.1-4.1=75-3.9+2.4=700-25-4=53 + 1.2-0.2=(9-3)x3-9=6200:25:4二40-(8+2)x3 =班级:用时:994-10=754-10=4.8+41.1=95.4+3.6=9+45+41=3
42、2.6x10=2x91x5=6.54-4.41=9x49+49=125x3x8=48x99+48=62+62x99=7+50+50+3=300:25:4二07+4.4-0.4=4.4+8.1-4.1=6.8+17+3.2=45+5+20+80=50：(8-3)x8二676:10二68.6-0.5=61.6+6.1=7.32+1.1=65.6:10二4x6x25=97x2x5=34x9+34=9x68+68=920-5-2=99x17+17=41+41x99=5.8-13-3.5=5.3+7.9-33=7.6+6.9 - 5.9二6.1-0.5+0.4=(9-4)x62=60+40+7+33=2
43、0:(8-6)x2二60-(4+6)x7 =80-(5 + 5)x9 =40-(5 + 5)x4=40(8 + 2)x3 =40+58+22+60二(8-2)x(8-4) =20(64-9x6) =80:(28-9x2)二70-(76-66)-4=1.85kg = ( )g0.4dm = ( )cm0.7 O 1.94.214 O 4.25.5 O 5.514811cm C 8.1m882m O 0.882km30+(5 + 5)x2= 70+27-(5-2)= 20+48-(9-3) = 76x18-76x8= 106-40-10-50=70(66-7x8) = 50-(86-76)-2 = 0.3m = ( )dm 134dm2 = ( )cm2 3.5 O 3.5834.53 O 4.35