88*99的简便运算

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88*99的简便运算
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88*99的简便运算
88*99的简便运算

88*99的简便运算
88*99=88*(100-1)=88*100-88*1=8712

88*99
=88*100-88
=8800-88
=8812
88*99
=8*9*11*11
=72*121
=8812

=(90-2)(90+9)
=90x90+7x90-18
=8100+630-18
=8712