78×32+67×32+78怎么做?

78 × 32 + 67 × 32 + 78
= （78 + 67）× 32 + 78
= 145 × 32 + 78
= 145 × 2 × 16 + 78
= 290 × 16 + 78
= 4640 + 78
= 4640 + 80 - 2
= 4720 - 2
= 4718
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