Question

6.9×3.7 63×0.69 简便算法

Answer 1

利用结合律。
6.9×3.7 +63×0.69
=6.9×3.7+ 6.3×6.9
=6.9×（3.7+6.3）
=6.9×10
=69

Answer 2

6.9×3.7 +63×0.69
=6.9×3.7+ 6.3×6.9
=6.9×（3.7+6.3）
=6.9×10
=69

Answer 3

6.9×3.7+63×0.69
=0.69x37+0.69x63
=0.69x（37+63）
=0.69x100
=69
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