计算(3m+2n)(7m-6n)

问题描述:

计算(3m+2n)(7m-6n)

(3m+2n)(7m-6n)
=21m²-4mn-12n²
如果不懂,请追问,祝学习愉快!

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