2.5×4.2+4.2+8.42的和简便方法?
2个回答
2020-02-09
展开全部
2.5×4.2+4.2+8.42
=4.2×(2.5+1)+8.42
=4.2×3.5+8.42
=(4+0.2)×3.5+8.42
=4×3.5+0.2×3.5+8.42
=14+0.7+8.42
=23.12
=4.2×(2.5+1)+8.42
=4.2×3.5+8.42
=(4+0.2)×3.5+8.42
=4×3.5+0.2×3.5+8.42
=14+0.7+8.42
=23.12
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