80道脱式计算答案过程.docx
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80道脱式计算答案过程
1.25X(8+10)
=1.25X8+1.25X10
=10+12.5=22.5
9123-(123+8.8)
=9123-123-8.8
=9000-8.8
=8991.2
1.24X8.3+8.3X1.76
=8.3X(1.24+1.76)
=8.3X3=24.9
9999X1001
=9999X(1000+1)
=9999X1000+9999X1
=10008999
14.8X6.3-6.3X6.5+8.3X3.7=(14.8-6.5)X6.3+8.3X3.7=8.3X6.3+8.3X3.78.3X(6.3+3.7)
=8.3X10
=83
1.24+0.78+8.76
=(1.24+8.76)+0.78
=10+0.78
=10.78
933-157-43
=933-(157+43)
=933-200
=733
4821-998
=4821-1000+2
=3823
I32X125X25
=4X8X125X25
=(4X25)X(8X125)
=100X1000
=100000
9048-268
=(2600+2600+2600+1248)-26
=2600-26+2600-26+2600-26+1248-269
=100+100+100+48
=348
2881-43
=(1290+1591)-434
=1290-43+1591-43
=30+37
3.2X42.3X3.75-12.5X0.423X16=3.2X42.3X3.75-1.25X42.3X1.6=42.3X(3.2X3.75-1.25X1.6)=42.3X(4X0.8X3.75-1.25X4X0.4)=42.3X(4X0.4X2X3.75-1.25X4X0.4)=42.3X(4x0.4x7.5-1.25x4x0.4)=42.3X[4X0.4X(7.5-1.25)]=42.3X[4X0.4X6.25]=42.3X(4X2.5)
=4237
1.8+18-1.5-0.5X0.3
=1.8+12-0.15
=13.8-0.15
=13.65
6.5X8+3.5X8-47
=52+28-47
=80-47
(80-9.8)X5分之2-1.32
=70.2X2/5-1.32
=28.08-1.32
=26.76
8X7分之4十[1-(3.2-2.95)]
=8X4/7-[1-0.25]
=8X4/7-4
=8/7
2700X(506-499)-900
=2700X7-900
=18900-900
=21
33.02-(148.4—90.85)+2.5
=33.02—57.55+2.5
=33.02—23.02
=10
(1+1—1)+5.1
=(1—1)+5.1
=0+5.1
=0
18.1+(3—0.299+0.23)X1
=18.1+1.7X1
=18.1+1.7
=19.8
卜18]+29+[-52]+60
=19
卜3]+[-2]+[-1]+0+1+2
=-3
卜301]+125+301+[-75]
=50
卜1]+[-1/2]+3/4+[-1/4]
=-1
卜7/2]+5/6+卜0.5]+4/5+19/6
=1.25
卜26.54]+卜6.14]+18.54+6.14
=-8
1.125+[-17/5]+[-1/8]+卜0.6]
=-3
0.8X1.25=1
0.3X3.6=1.08
0.3X0.3=0.09
10X0.07=0.7
0.92X0.4=0.368
0.2X0.26=0.052
0.14X4=0.56
0.02X0.1=0.002
1.2X0.3=0.36
2.5X0.4=1
0.22X4=0.88
3.25X0=0
0.9—0.52=0.38
3.99X1=3.99
0X3.52=0
12.5X8=100
8-10=0.8
10-1.8-7.2=1
0.43+3.57=4
2.5X4X12=144
7.5x-3x=
4.5x
a+3a+7a==11a
1.05X100=
105
1-0.5=
2
0.96-3=
0.32
0.56X100=56
3.78X100=
378
4-0.8=5
3.215X100=321.5
0.8X10=8
1.1X0.2=0.22
0.6X0.8=0.48
3X0.9=2.7
2.5X0.4=1
0.16X5=0.8
1.78+2.2=3.98
1.2X0.5-0.4=0.2
0.7-0.01=70
2.5X0.4=1
12—3.9=8.1
6.6-0.66=10
5.37X0+4.63=4.63
3.9+2.03=5.93
7.2+2.8=10
1.4X5=7
3/5+(-2/3)
=9/15+(-10/15)
=-(10/15-9/15)
=-1/15
1/2+(-2/3)+4/5+(-1/2)+(-1/3)
=[1/2+(-1/2)]+[(-2/3)+(-1/3)]+4/5
=-1/5
13/17-3.5-6+2.5+6+4/17
=[(13/17+4/17]+[(-3.5)+2.5]+[-6+6]
=1+(-1)+0
=0
(-3.8)+2.7+(-0.43)+1.3+(-0.2)
=[(-3.8)+(-0.2)]+[2.7+1.3]+(-0.43)=(-4)+4+(-0.43)=-0.43
5/6+(-3/4)
=10/12+(-9/12)
=10/12-9/12
=1/12
[(-57/8)+2.125]+[(-3.37)+(-2.63)]+[25/4+(-0.25)]
=[(-7.125)+2.125]-6+[6.25-0.25]
=(-5)+(-6)+6
=-5
(-32)-(+5)
=(-32)+(-5)
=-37
7.3-(-6.8)
=7.3+(+6.8)
=14.1
(-1/50-(-2/3)-(+0.48)-(+4/9)
=(-1/50)+(+2/3)+(-0.48)+(-4/9)
=-1/50+2/3-0.48-4/9
=-1/50-0.48+2/3-4/9
=(-0.02-0.48)+(6/9-4/9)
=-5/18
(-2)-(-25)
=(-2)+(+25)
=23
1/2*(-1/4)
=-(1/2*1/4)
=-1/8
(-1/2)*(-3/4)
=+(1/2*3/4)
=3/8
(-3)*5/6*(-3/5)*(-9/4)=-3*5/6*3*5*9/4
=-27/8
(-0.25)*0.5*(-100)*4
=(-4*0.25)*[0.5*(-100)]=-1*(-50)=50
(-5)*10/3+2*10/3+(-6)*10/3
=(-5+2-6)*10/3
=-9*(3+1/3)
=-27-3
=-30
-13*2/3-0.34*2/7+1/3*(-13)-5/7*0.34
=卜13*2/3+1/3*(-13)]+(-0.34*2/7-5/7*0.34)
=-13*(2/3+1/3)+0.34*(-2/7-5/7)
=-13-0.34
=-13.34
(-3)-(-7/4)*0.75*7/3-3
=-3*(-4/7)*3/4*7/3*1/3
=3*4/7*3/4*7/3*1/3
=1
-3-【-5+(1-0.2*3/5)+(-2)】
=-3-[-5+(1-3/25)+(-2)]
=-3-[-5+22/25*(-1/2)]
=-3-(-5-11/25)
=-3+5又11/25=2又11/25
15+(1/5-1/3)
=15+(-2/15)
=-15*15/2
=-225/2
(-5/6)+(-2/3)*(-3/2)
=(-5/6)*(-3/2)*(-3/2)
=-5/6*3/2*3/2
=-15/8