69×38+69×51+69×19用简便算法怎么算7×28+28

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69×38+69×51+69×19用简便算法怎么算7×28+28

69×38+69×51+69×19用简便算法怎么算7×28+28
69×38+69×51+69×19用简便算法怎么算
7×28+28

69×38+69×51+69×19用简便算法怎么算7×28+28
69×38+69×51+69×19
=69*(38+51+19)
=69*108
=7452

69×(38+51+19)

69*(38+51+19)=69*108=69*100+69*8=7472