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问题: 数学

972/(720-21x33)简算怎么做

解答:

972/(720-21x33)简算可以这样做:

972/(720-21×33)=36×9×3/(21×36-21×33-36)
=36×9×3/21×(36-33)-36=36×9×3/21×3-12×3
=36×9×3/(21-12)×3=36×9×3/9×3=36