用简便方法计算；3.85乘以9.9+0.385 5.6乘以48乘以4.2乘以5.6+5.6 3.45乘以3.6+0.345乘以64
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3.85×9.9+0.385
=3.85×9.9+3.85×0.1
=3.85×(9.9+0.1)
=3.85×10
=38.5
=3.85×9.9+3.85×0.1
=3.85×(9.9+0.1)
=3.85×10
=38.5
追答
5.6×4.8+4.2×5.6
=5.6×(4.8+4.2)
=5.6×9
=50.4
3.45×3.6+0.345×64
=3.45×3.6+3.45×6.4
=3.45×(3.6+6.4)
=3.45×10
=34.5
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