计算(3m+2n)(7m-6n)
问题描述:
计算(3m+2n)(7m-6n)
答
(3m+2n)(7m-6n)
=21m²-4mn-12n²
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答
(3m+2n)(7m-6n)
=3mx7m-3mx6n+2nx7m-2nx6n
=21m²-18mn+14mn-12n²
=21m²-4mn-12n²
希望可以帮到你.