五年级数学上册口算题大全(共237页).doc

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1、精选优质文档-倾情为你奉上66÷0.1=0.41+0.3=10-5.85=8.1×0.7=9÷0.25=0÷9.45=0.65×0.7=0.45×3=75×0.004×2.5=0.008×89×12.5=0.7×0.04=0.6+8.6=0.4×2.5=20.7÷3=平方米=( )公顷2.294千克=( )克6千米442米=( )千米8时54分（ ）时0.6分（ ）秒3x+7x=x+x+x+x=8÷0.1=0.5+2.7=10-9.01=1.1×

2、0.3=3÷0.25=0÷7.91=0.3×0.8=0.1×4.5=14×0.4×2.5=0.08×90×12.5=0.9×0.06=9.8+9.4=3.6×25=31÷5=平方米=( )公顷9.619千克=( )克8千米951米=( )千米2时42分（ ）时0.8分（ ）秒9x+5x=x+x+x+x=50÷0.01=0.65+6.2=10-7.85=6.6×0.2=10÷0.25=0÷8.98=0.2×0.8=0.45×2.

3、5=99×0.004×2.5=0.8×3×1.25=0.8×0.03=3.2+1.5=1.2×0.25=43.2÷6=平方米=( )公顷9.45千克=( )克9千米436米=( )千米4时42分（ ）时0.6分（ ）秒8x+3x=x+x+x+x=79÷0.01=0.45+3.6=10-6.89=8.3×0.1=1÷0.25=0÷8.1=0.25×0.9=0.2×4.5=25×0.004×0.025=0.08×88×12.5=0

4、.3×0.07=7.4+8.2=2.8×25=16.8÷3=平方米=( )公顷7.142千克=( )克3千米100米=( )千米5时36分（ ）时0.9分（ ）秒4x+2x=m+m+m+m+m=81÷0.01=0.4+7.9=10-6.59=3×0.2=6÷0.25=0÷1.59=0.2×0.9=0.2×1.5=32×0.04×0.25=0.08×25×0.125=0.1×0.08=0.8+2.3=2.4×2.5=63÷7=平方米=(

5、)公顷7.352千克=( )克3千米515米=( )千米6时42分（ ）时0.3分（ ）秒5x+9x=n+n+n=76÷0.1=0.92+7.9=10-9.78=8.9×0.3=10÷0.25=0÷6.39=0.3×0.8=0.45×2=53×0.4×0.025=0.008×73×0.125=0.2×0.05=7+1.9=0.8×2.5=11÷5=平方米=( )公顷8.604千克=( )克9千米18米=( )千米9时30分（ ）时0.9分（ ）秒7x+3x=x+x+

6、x+x=78÷0.1=0.59+6.9=10-4.53=2.4×0.8=6÷0.25=0÷5.59=0.05×0.7=0.15×2=7×0.04×2.5=0.8×21×0.125=0.7×0.05=4.1+1.5=0.8×25=26.4÷8=平方米=( )公顷7.274千克=( )克1千米633米=( )千米6时48分（ ）时0.7分（ ）秒3x+5x=n+n+n=84÷0.001=0.95+3=10-9.7=6.5×0.8=7÷0.2

7、5=0÷3.22=0.85×0.8=0.15×3.5=81×0.4×0.025=0.8×4×0.125=0.5×0.05=2.9+5.9=0.8×2.5=58.1÷7=80000平方米=( )公顷7.213千克=( )克9千米844米=( )千米1时18分（ ）时0.1分（ ）秒7x+6x=x+x+x+x=8÷0.001=0.29+0.2=10-8.31=5.2×0.4=5÷0.25=0÷8.57=0.7×0.5=0.4×4.5=88&

8、#215;0.004×0.25=0.8×38×0.125=0.2×0.09=8.2+3.7=2.8×2.5=18.8÷4=平方米=( )公顷3.069千克=( )克1千米536米=( )千米5时12分（ ）时0.8分（ ）秒6x+8x=m+m+m+m+m=9÷0.001=0.39+9.2=10-5.63=2.9×0.4=4÷0.25=0÷7.89=0.1×0.7=0.25×0.5=76×0.04×0.025=0.8×22×0.125=0

9、.4×0.03=7.9+2.3=0.4×2.5=49÷5=平方米=( )公顷2.926千克=( )克8千米475米=( )千米8时36分（ ）时0.3分（ ）秒7x+6x=m+m+m+m+m=43÷0.1=0.18+6.1=10-4.29=4×0.7=1÷0.25=0÷7.6=0.7×0.7=0.3×2.5=10×0.004×0.25=0.008×4×1.25=0.5×0.04=7.7+4.4=1.6×0.25=11.1÷3=平方米=(

10、 )公顷7.998千克=( )克7千米295米=( )千米5时36分（ ）时0.6分（ ）秒2x+5x=m+m+m+m+m=31÷0.001=0.29+2.3=10-3.68=3.3×0.6=2÷0.25=0÷7.59=0.05×0.3=0.25×0.5=31×0.04×2.5=0.08×29×12.5=0.2×0.05=4.9+1.7=3.6×0.25=11.8÷2=平方米=( )公顷4.766千克=( )克8千米341米=( )千米7时54分（ ）时0.8分（

11、）秒3x+7x=x+x+x+x=32÷0.1=0.69+5.3=10-2.03=7.7×0.6=9÷0.25=0÷9.27=0.35×0.4=0.1×1=67×0.04×0.25=0.8×99×0.125=0.3×0.03=1.8+8.6=3.2×0.25=32.8÷8=平方米=( )公顷5.576千克=( )克9千米611米=( )千米6时30分（ ）时0.1分（ ）秒9x+8x=x+x+x+x=56÷0.01=0.87+4.4=10-8.26=2.1&

12、#215;0.1=6÷0.25=0÷1.15=0.5×0.5=0.1×4=57×0.004×0.25=0.8×44×1.25=0.7×0.07=9.5+7.6=2×25=46÷5=平方米=( )公顷8.417千克=( )克9千米44米=( )千米2时24分（ ）时0.3分（ ）秒5x+9x=m+m+m+m+m=7÷0.01=0.83+7.9=10-1.2=9×0.6=9÷0.25=0÷8.93=0.9×0.5=0.35×3.5

13、=22×0.4×2.5=0.008×16×12.5=0.8×0.06=8.3+8.2=3.6×2.5=71.1÷9=平方米=( )公顷3.055千克=( )克3千米674米=( )千米1时48分（ ）时0.3分（ ）秒3x+9x=n+n+n=41÷0.01=0.24+1.1=10-2.06=4.2×0.9=4÷0.25=0÷8.63=1×0.7=0.3×3=89×0.4×0.25=0.08×29×12.5=0.6×0

14、.01=6.8+7.1=2.4×2.5=12.6÷6=平方米=( )公顷5.055千克=( )克5千米472米=( )千米5时18分（ ）时0.5分（ ）秒8x+2x=t+t+t+t=57÷0.001=0.52+0.8=10-9.62=5.2×0.9=6÷0.25=0÷4.75=0.85×0.6=0.4×2=50×0.04×0.025=0.08×3×12.5=0.9×0.07=1.8+2.1=1.6×0.25=14.8÷2=平方米=( )公顷5.

15、265千克=( )克2千米912米=( )千米5时24分（ ）时0.8分（ ）秒8x+5x=n+n+n=89÷0.01=0.97+0.4=10-2.71=9.5×0.2=2÷0.25=0÷2.82=0.9×0.2=0.25×4=42×0.004×0.025=0.008×28×1.25=0.6×0.01=6.2+0.1=2×0.25=16.1÷7=平方米=( )公顷4.658千克=( )克8千米125米=( )千米8时6分（ ）时0.2分（ ）秒8x+6x=n+n+n

16、=30÷0.001=0.67+6=10-8.77=2.3×0.9=6÷0.25=0÷3.9=0.85×0.3=0.45×4=75×0.004×0.25=0.008×48×1.25=0.5×0.04=6+1.1=2×2.5=53.1÷9=平方米=( )公顷3.537千克=( )克9千米624米=( )千米5时6分（ ）时0.4分（ ）秒4x+3x=n+n+n=85÷0.001=0.19+3.3=10-1.17=1.2×0.5=4÷0.25

17、=0÷2.22=0.35×0.2=0.05×1=67×0.04×0.25=0.008×98×1.25=0.9×0.02=8.7+6.3=0.8×2.5=31.5÷5=平方米=( )公顷3.621千克=( )克7千米754米=( )千米5时30分（ ）时0.1分（ ）秒7x+6x=n+n+n=98÷0.1=0.65+2.5=10-5.5=2.8×0.9=2÷0.25=0÷2.46=0.15×0.5=0.35×1=66×0.004

18、×0.025=0.8×7×0.125=0.3×0.05=6.9+2.1=2.4×0.25=6.3÷3=平方米=( )公顷8.91千克=( )克7千米362米=( )千米1时6分（ ）时0.2分（ ）秒4x+5x=m+m+m+m+m=63÷0.01=0.52+4.8=10-8.21=9.3×0.6=4÷0.25=0÷7.28=0.65×0.3=0.35×4.5=41×0.04×0.25=0.8×28×1.25=0.1×0.07=

19、8.1+7.1=3.2×2.5=12.8÷4=平方米=( )公顷4.633千克=( )克2千米150米=( )千米2时48分（ ）时0.4分（ ）秒8x+2x=t+t+t+t=55÷0.001=0.65+1.7=10-5.08=2.2×0.5=6÷0.25=0÷7.78=0.85×0.3=0.1×4.5=92×0.4×2.5=0.008×53×12.5=0.7×0.01=0.3+7.2=0.8×25=31.5÷5=平方米=( )公顷2.88千克=

20、( )克7千米773米=( )千米5时18分（ ）时0.1分（ ）秒7x+7x=t+t+t+t=53÷0.01=0.03+1.9=10-7.91=4.6×0.5=6÷0.25=0÷4.47=0.65×0.7=0.35×4=96×0.004×2.5=0.08×41×12.5=0.2×0.08=2.7+6.8=0.4×25=16.2÷9=平方米=( )公顷2.229千克=( )克6千米246米=( )千米9时24分（ ）时0.9分（ ）秒6x+7x=a+a+a+a=24

21、÷0.1=0.8+3.5=10-8.69=3.4×0.1=7÷0.25=0÷8.15=0.45×0.4=0.35×2=48×0.004×2.5=0.8×49×0.125=0.8×0.05=9.1+9.1=2×25=60.2÷7=平方米=( )公顷5.793千克=( )克2千米196米=( )千米5时18分（ ）时0.1分（ ）秒7x+7x=n+n+n=24÷0.1=0.09+2.5=10-8.17=4.2×0.2=3÷0.25=0

22、47;3.8=0.5×0.2=0.1×4=2×0.004×2.5=0.8×76×12.5=0.1×0.06=7.5+4.2=3.6×0.25=9.6÷3=平方米=( )公顷9.753千克=( )克4千米192米=( )千米4时24分（ ）时0.7分（ ）秒8x+5x=t+t+t+t=38÷0.1=0.84+8.2=10-7.01=3.3×0.2=8÷0.25=0÷7.82=0.05×0.8=0.05×2=69×0.4×0.25

23、=0.08×92×1.25=0.7×0.06=9.3+4.3=3.2×0.25=11.6÷2=平方米=( )公顷7.305千克=( )克5千米373米=( )千米1时36分（ ）时0.7分（ ）秒6x+5x=a+a+a+a=49÷0.001=0.06+2.9=10-7.5=1.9×0.8=3÷0.25=0÷3.52=0.95×0.1=0.35×2=26×0.004×0.25=0.8×80×1.25=0.2×0.05=0.1+2.5=2&

24、#215;25=28÷8=平方米=( )公顷9.471千克=( )克1千米236米=( )千米7时6分（ ）时0.5分（ ）秒2x+3x=x+x+x+x=61÷0.001=0.56+9.4=10-6.9=8.4×0.8=9÷0.25=0÷7.34=0.9×0.7=0.15×1=96×0.004×0.025=0.008×18×12.5=0.9×0.05=8.8+4.9=2.4×0.25=28.5÷3=平方米=( )公顷5.762千克=( )克2千米189米=

25、( )千米4时54分（ ）时0.2分（ ）秒4x+8x=m+m+m+m+m=89÷0.1=0.8+9.1=10-8.63=2.8×0.1=3÷0.25=0÷9.05=1×0.2=0.3×1.5=71×0.4×0.025=0.08×36×12.5=0.3×0.01=4.9+0.1=1.2×25=61.6÷8=平方米=( )公顷8.588千克=( )克7千米164米=( )千米9时42分（ ）时0.3分（ ）秒9x+3x=a+a+a+a=96÷0.001=0.

26、6+3.7=10-6.2=6.5×0.3=5÷0.25=0÷4.21=0.85×0.6=0.25×2.5=47×0.4×0.025=0.8×61×12.5=0.8×0.08=9.7+5=3.6×0.25=16.5÷3=平方米=( )公顷5.256千克=( )克7千米549米=( )千米5时36分（ ）时0.1分（ ）秒7x+3x=m+m+m+m+m=8÷0.1=0.35+1.4=10-9.21=6.2×0.8=3÷0.25=0÷6.2=

27、0.9×0.5=0.1×3.5=72×0.004×0.25=0.08×3×0.125=0.2×0.03=2.1+5.2=2×2.5=25.8÷3=平方米=( )公顷2.337千克=( )克2千米137米=( )千米7时6分（ ）时0.9分（ ）秒9x+6x=t+t+t+t=71÷0.01=0.86+2.8=10-1.67=2.8×0.3=2÷0.25=0÷7.69=0.45×0.6=0.35×1=95×0.04×0.25=0.

28、08×24×12.5=0.9×0.05=7.7+5.1=2.4×2.5=7.5÷5=平方米=( )公顷4.655千克=( )克4千米621米=( )千米4时54分（ ）时0.2分（ ）秒7x+9x=m+m+m+m+m=30÷0.001=0.07+9.1=10-7.4=3.8×0.4=9÷0.25=0÷3.03=0.05×0.9=0.3×4.5=2×0.4×2.5=0.08×37×1.25=0.9×0.04=3.2+1.9=2.4

29、5;2.5=45÷5=平方米=( )公顷7.409千克=( )克5千米74米=( )千米2时42分（ ）时0.9分（ ）秒5x+5x=n+n+n=61÷0.1=0.36+4.4=10-7.14=8.7×0.3=4÷0.25=0÷6.03=0.05×0.2=0.35×2=46×0.4×0.25=0.8×67×12.5=0.3×0.02=9.4+0.8=0.4×2.5=40.2÷6=平方米=( )公顷2.755千克=( )克9千米346米=( )千米1时18分

30、（ ）时0.4分（ ）秒9x+4x=x+x+x+x=96÷0.001=0.67+4.5=10-5.79=1.9×0.9=4÷0.25=0÷9.51=0.5×0.8=0.3×1=64×0.4×0.025=0.08×7×0.125=0.3×0.06=9.9+2.3=2.4×0.25=36.8÷8=40000平方米=( )公顷7.188千克=( )克8千米643米=( )千米4时24分（ ）时0.9分（ ）秒7x+6x=t+t+t+t=11÷0.1=0.06+6

31、.3=10-4.52=6.9×0.4=6÷0.25=0÷2.29=0.2×0.3=0.3×0.5=99×0.4×2.5=0.08×45×1.25=0.6×0.02=3.9+5.5=2×0.25=16.8÷8=平方米=( )公顷4.057千克=( )克7千米774米=( )千米3时42分（ ）时0.9分（ ）秒5x+3x=t+t+t+t=8÷0.1=0.91+8.9=10-4.36=3×0.5=1÷0.25=0÷5.39=0.9×

32、;0.1=0.4×3.5=94×0.4×0.025=0.8×80×1.25=0.6×0.01=7.4+3.2=3.6×25=14÷4=平方米=( )公顷6.671千克=( )克4千米447米=( )千米1时6分（ ）时0.2分（ ）秒8x+3x=m+m+m+m+m=16÷0.1=0.68+4.4=10-5.44=8.8×0.7=6÷0.25=0÷6.01=0.4×0.8=0.2×4.5=35×0.4×0.25=0.08×11&

33、#215;12.5=0.7×0.09=9.5+1.9=2.8×0.25=13.2÷3=平方米=( )公顷4.434千克=( )克5千米538米=( )千米3时54分（ ）时0.9分（ ）秒5x+9x=n+n+n=88÷0.1=0.84+6=10-8.55=1.2×0.3=3÷0.25=0÷9.71=0.35×0.5=0.1×0.5=41×0.004×0.025=0.008×99×0.125=0.8×0.06=6.7+6.3=0.4×2.5=11.

34、7÷9=平方米=( )公顷2.927千克=( )克1千米407米=( )千米2时6分（ ）时0.6分（ ）秒9x+6x=t+t+t+t=85÷0.001=0.46+8.1=10-2.56=8.6×0.6=6÷0.25=0÷5.69=0.45×0.2=0.4×0.5=25×0.04×2.5=0.8×74×0.125=0.2×0.02=2.4+1.5=1.6×2.5=65.1÷7=平方米=( )公顷9.839千克=( )克3千米482米=( )千米5时36分（

35、 ）时0.2分（ ）秒9x+6x=a+a+a+a=64÷0.1=0.57+0.9=10-8.4=5.4×0.4=10÷0.25=0÷1.78=1×0.6=0.45×3=25×0.4×0.25=0.008×57×1.25=0.9×0.07=5.5+1.6=2×2.5=23.8÷7=10000平方米=( )公顷1.958千克=( )克3千米50米=( )千米3时54分（ ）时0.8分（ ）秒3x+4x=a+a+a+a=50÷0.1=0.64+4.8=10-3.

36、49=5.2×0.8=3÷0.25=0÷5.27=0.9×0.4=0.05×3.5=18×0.04×0.025=0.08×22×12.5=0.9×0.03=1+1.6=2.8×0.25=57.6÷6=平方米=( )公顷7.544千克=( )克5千米852米=( )千米8时36分（ ）时0.2分（ ）秒7x+7x=a+a+a+a=87÷0.01=0.04+1.7=10-9.85=1.3×0.7=3÷0.25=0÷6.41=0.35

37、5;0.5=0.3×4=58×0.04×0.025=0.008×47×12.5=0.1×0.01=2.3+5.1=2×2.5=15.6÷3=平方米=( )公顷9.366千克=( )克9千米579米=( )千米2时42分（ ）时0.8分（ ）秒4x+3x=x+x+x+x=70÷0.001=0.46+9.4=10-4.63=7×0.9=4÷0.25=0÷8.18=0.95×0.7=0.25×2=49×0.04×2.5=0.08×5

38、8×1.25=0.4×0.06=0.8+6.1=2.4×2.5=21.2÷4=平方米=( )公顷6.597千克=( )克6千米886米=( )千米6时12分（ ）时0.4分（ ）秒7x+8x=t+t+t+t=20÷0.01=0.67+2=10-8=3.7×0.4=4÷0.25=0÷9.63=0.55×0.4=0.4×4.5=40×0.4×0.25=0.008×17×12.5=0.6×0.06=9.6+5=2×25=16.8÷2

39、=平方米=( )公顷7.147千克=( )克4千米405米=( )千米6时48分（ ）时0.8分（ ）秒7x+3x=n+n+n=86÷0.1=0.24+5.4=10-7.98=6.4×0.6=2÷0.25=0÷5.8=0.85×0.2=0.05×4=29×0.04×2.5=0.08×23×12.5=0.3×0.09=4.6+5.9=3.6×2.5=61.6÷8=平方米=( )公顷1.383千克=( )克8千米605米=( )千米5时42分（ ）时0.2分（ ）秒7x

40、+4x=x+x+x+x=22÷0.1=0.35+0.7=10-3.39=8×0.4=2÷0.25=0÷9.87=0.5×0.5=0.25×3.5=97×0.004×0.25=0.8×65×0.125=0.6×0.03=3.4+7.2=0.8×0.25=8.7÷3=80000平方米=( )公顷3.15千克=( )克2千米567米=( )千米5时48分（ ）时0.9分（ ）秒9x+4x=x+x+x+x=94÷0.1=0.33+5.6=10-9.11=1

41、5;0.1=2÷0.25=0÷9.52=1×0.1=0.05×0.5=67×0.004×2.5=0.08×50×1.25=0.9×0.04=6.5+1.7=2.8×25=45.6÷8=平方米=( )公顷5.186千克=( )克2千米447米=( )千米4时42分（ ）时0.2分（ ）秒2x+4x=t+t+t+t=98÷0.01=0.22+4.9=10-9.1=8.9×0.4=5÷0.25=0÷3.4=0.8×0.7=0.4×0

42、.5=12×0.04×2.5=0.08×8×12.5=0.7×0.03=7.8+3.9=0.8×0.25=51.3÷9=平方米=( )公顷6.677千克=( )克1千米687米=( )千米6时6分（ ）时0.4分（ ）秒8x+9x=m+m+m+m+m=62÷0.001=0.57+4=10-1.53=1.9×0.3=7÷0.25=0÷6.63=0.8×0.3=0.15×3=85×0.04×0.25=0.08×65×12.5=0.

43、4×0.02=1.9+3.2=2×25=26.4÷6=平方米=( )公顷9.915千克=( )克6千米607米=( )千米2时24分（ ）时0.6分（ ）秒5x+6x=x+x+x+x=3÷0.01=0.33+1.3=10-3.11=6.1×0.1=1÷0.25=0÷1.72=0.05×0.1=0.15×0.5=95×0.4×0.25=0.08×96×1.25=0.7×0.03=9.5+7.3=2×2.5=24.6÷6=平方米=( )公顷

44、1.357千克=( )克6千米601米=( )千米9时18分（ ）时0.2分（ ）秒2x+6x=a+a+a+a=11÷0.001=0.6+9.2=10-8.73=9.9×0.3=9÷0.25=0÷2.05=0.55×0.7=0.4×2=69×0.004×0.25=0.08×93×1.25=0.9×0.08=5.2+3.3=3.2×25=55.8÷9=平方米=( )公顷3.827千克=( )克9千米471米=( )千米8时36分（ ）时0.9分（ ）秒6x+2x=n+

45、n+n=65÷0.001=0.12+8.4=10-7.83=4.8×0.9=9÷0.25=0÷4.95=0.65×0.3=0.05×4=35×0.004×2.5=0.8×44×0.125=0.6×0.04=3+5.8=3.2×0.25=6÷2=平方米=( )公顷8.108千克=( )克6千米923米=( )千米5时42分（ ）时0.8分（ ）秒2x+2x=m+m+m+m+m=4÷0.01=0.25+3.7=10-4.21=2.6×0.7=9

46、47;0.25=0÷8=0.85×0.5=0.2×2=76×0.4×0.25=0.8×30×12.5=0.8×0.03=1.8+1.1=2.8×2.5=72.9÷9=平方米=( )公顷7.928千克=( )克2千米967米=( )千米6时48分（ ）时0.3分（ ）秒7x+7x=x+x+x+x=10÷0.1=0.9+7=10-2.33=3.1×0.6=7÷0.25=0÷6.48=0.85×0.8=0.05×3=24×0.004

47、×0.025=0.8×39×1.25=0.7×0.01=5.7+6.1=0.4×0.25=30÷6=平方米=( )公顷1.732千克=( )克9千米81米=( )千米2时18分（ ）时0.5分（ ）秒7x+9x=a+a+a+a=87÷0.001=0.14+3.2=10-8.53=6.9×0.3=1÷0.25=0÷4.22=0.4×0.8=0.35×4.5=43×0.4×2.5=0.008×21×12.5=0.8×0.09=9+

48、9.5=2.8×25=28.8÷6=平方米=( )公顷6.228千克=( )克1千米93米=( )千米6时6分（ ）时0.7分（ ）秒9x+4x=n+n+n=98÷0.001=0.03+3.2=10-3.93=2.4×0.7=6÷0.25=0÷8.49=0.5×0.8=0.45×2.5=93×0.004×0.025=0.008×70×1.25=0.2×0.09=9.6+2.5=1.6×0.25=31.2÷4=平方米=( )公顷6.2千克=( )克

49、4千米639米=( )千米8时18分（ ）时0.6分（ ）秒4x+4x=n+n+n=39÷0.01=0.62+9.6=10-6.56=5.6×0.8=5÷0.25=0÷2.2=1×0.4=0.4×3=75×0.4×2.5=0.008×44×1.25=0.5×0.09=5+2.1=1.2×25=20÷4=平方米=( )公顷3.351千克=( )克4千米399米=( )千米7时36分（ ）时0.3分（ ）秒9x+4x=n+n+n=21÷0.01=0.22+6.3=10-8.48=5.5×0.6=5÷0.25=0÷8.52=0.05×0.2=0.4×4.5=41×0.004×2.5=0.08×57×0.125=0.5×0.02=8.2+8.9=1.2×0.25=17.1÷3=平方米=( )公顷6.55千克=( )克5千米96米=( )千米8时12分（ ）时0.8分（ ）秒3x+6x=a+a+a+a=82÷0