脱式计算及答案

=（0.4×25）×（125×0.8)

=10×100=1000 

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

=91.2 

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 

=100099 

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]

=8×7分之4÷4

=8/7

2700×（506－499）÷900 

=2700×7÷900 

=100÷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