0.4×125×25×0.8

=（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

=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

3.42×5.7＋4.3×3.428.75×11－8.757.42×20.1

5.9×2.7＋0.59×730.358×14.7＋35.8×0.853

2.7×3.0140.847×350.079×0.23