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)

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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)

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)
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)

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