Question

脱式计算。。。。。

2881÷ 43

3.2×42.3×3.75-12.5×0.423×16
1.8+18÷1.5-0.5×0.3
6.5×8+3.5×8-47
(80-9.8)×5分之2-1.32

8×7分之4÷[1÷(3.2-2.95)]

2700×（506－499）÷900
33.02－（148.4－90.85）÷2.5
（1÷1－1）÷5.1

18.1＋（3－0.299÷0.23）×1

Answer 1

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
这是我在静心思考后得出的结论，
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Answer 2

Answer 3

Answer 4