3.6×6.3-6.3+63×0.74怎么巧算?
1个回答
3.6×6.3-6.3+63×0.74
=3.6×6.3-6.3+6.3×(10×0.74)
=3.6×6.3-6.3+6.3×7.4
=(3.6-1+7.4)×6.3
=10×6.3
=63
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