80道脱式计算答案解析过程
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1.25×（8+10）
=1.25×8+1.25×10
=10+12.5=22.5
9123-（123+8.8）
=9123-123-8.8
=9000-8.8
=8991.2
1.24×8.3+8.3×1.76
=8.3×（1.24+1.76)
=8.3×3=24.9
9999×1001
=9999×（1000+1）
=9999×1000+9999×1
=10008999
14.8×6.3-6.3×6.5＋8.3×3.7 =（14.8-6.5）×6.3＋8.3×3.7 =8.3×6.3+8.3×3.7
8.3×（6.3＋3.7）
=8.3×10
=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
I32×125×25
=4×8×125×25
=（4×25）×（8×125）
=100×1000
=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
3.2×42.3×3.75-12.5×0.423×16
=3.2×42.3×3.75-1.25×42.3×1.6
=42.3×(3.2×3.75-1.25×1.6)
=42.3×(4×0.8×3.75-1.25×4×0.4)
=42.3×(4×0.4×2×3.75-1.25×4×0.4) =42.3×(4x0.4x7.5-1.25x4x0.4)
=42.3×[4×0.4×(7.5-1.25)]
=42.3×[4×0.4×6.25]
=42.3×(4×2.5)
=4237
1.8+18÷1.5-0.5×0.3
=1.8+12-0.15
=13.8-0.15
=13.65
6.5×8+3.5×8-47
=52+28-47
=80-47
(80-9.8)×5分之2-1.32
=70.2X2/5-1.32
=28.08-1.32
=26.76
8×7分之4÷[1÷(3.2-2.95)]
=8×4/7÷[1÷0.25]
=8×4/7÷4
=8/7
2700×（506－499）÷900
=2700×7÷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）×1 =18.1＋1.7×1
=18.1＋1.7
=19.8
[-18]+29+[-52]+60
= 19
[-3]+[-2]+[-1]+0+1+2
= -3
[-301]+125+301+[-75]
= 50
[-1]+[-1/2]+3/4+[-1/4]
= -1
[-7/2]+5/6+[-0.5]+4/5+19/6
= 1.25
[-26.54]+[-6.14]+18.54+6.14 = -8
1.125+[-17/5]+[-1/8]+[-0.6] = -3
0.45×2.5＝1.125
0.8×1.25＝1
0.3×3.6＝1.08 0.3×0.3＝0.09
10×0.07＝ 0.7 0.92×0.4＝ 0.368 0.2×0.26＝0.052 0.14×4＝0.56
0.02×0.1＝0.002
1.2×0.3＝ 0.36
2.5×0.4＝1
2.4×5＝12
0.22×4＝ 0.88 3.25×0＝0
0.9－0.52＝ 0.38 3.99×1＝3.99
0×3.52＝ 0
12.5×8＝100
8÷10 = 0.8
10-1.8-7.2= 1
0.43+3.57= 4
2.5×4×12=144 0.9×0.8= 0.72
7.5x-3x = 4.5x
a+3a+7a== 11a
1.05×100= 105
1÷0.5= 2
0.96÷3= 0.32
0.56×100= 56
3.78×100= 378
4÷0.8 =5
3.215×100= 321.5 0.8×10= 8
4.08×100= 408
1.1×0.2 =0.22
0.6×0.8 = 0.48
3×0.9= 2.7
2.5×0.4= 1
0.16×5 ＝ 0.8
1.78＋
2.2 =
3.98
1.2×0.5-0.4 = 0.2 0.7÷0.01 = 70
2.5×0.4 = 1
12－3.9= 8.1
1.25×8÷1.25 = 8