简便计算.3.78×99+3.78 42.2×10 - 知识问答

简便计算.3.78×99+3.78 42.2×103 8.3×99 0.125×3.20.25

1个回答

3.78×99+3.78
=3.78×（99+1）
=3.78×100
=378
42.2×103
=42.2×（100+3）
=42.2×100+42.2×3
=4220+126.6
=4346.6
8.3×99
=8.3×（100-1）
=8.3×100-8.3
=830-8.3
=821.7
0.125×3.2×0.25
=0.125×8×（0.4×0.25）
=1×0.1
=0.1

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