99+99×68怎样巧算

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分析春棚：用乘法分配率的逆明森颂激郑应用：ab+ac=a(b+c)
解：99+99x68=99x(1+68)=99x69=6831

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99+99×68
=99×(1+68)
=99×69
=(100-1)×69
=100×69-1×69
=6900-69
=6831

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=99×(1+68)
=99×69
=(100-1)×69
=6900-69
=6831

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99+99×68
=99×69
=6900-69
=6831

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