84÷72÷36×21的简便算法

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84÷72÷36×21的简便算法
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84÷72÷36×21的简便算法
84÷72÷36×21的简便算法

84÷72÷36×21的简便算法
84÷72÷36×21
= 84×21÷72÷36
= 7×12×3×7÷72÷36
= 7×36×7÷72÷36
= 7×7÷72
= 49/72

=21*4/(72/36)*21
=21*21*2
=441*2
=882