(7m-8n)(x+y)-(3m-2n)(x+y)
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(7m-8n)(x+y)-(3m-2n)(x+y)(7m-8n)(x+y)-(3m-2n)(x+y)(7m-8n)(x+y)-(3m-2n)(x+y)答:=(7m-8n-3m+2n)(x+y)=(4m
(7m-8n)(x+y)-(3m-2n)(x+y)
(7m-8n)(x+y)-(3m-2n)(x+y)
(7m-8n)(x+y)-(3m-2n)(x+y)
答:=(7m-8n-3m+2n)(x+y)
=(4m-6n)(x+y)
=(7m-8n-3m+2n)(x+y)
=(5m-6n)(x+y)
(7m-8n)(x+y)-(3m-2n)(x+y)
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x^n*y*(-x^2y^m)
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