初三数学题整式乘法.

问题描述:

初三数学题整式乘法.
①(-5-1/3)(3/5x-3/4y+2)
②m(m+7)-(m+3)(m-2)

1(-5-1/3)(3/5x-3/4y+2)
=(-16/3)(3/5x-3/4y+2)
=-16/5x+4y-32/3
2 m(m+7)-(m+3)(m-2)
=m^2+7m-(m^2-2m+3m-6)
=m^2+7m-m^2-m+6
=6m+6