Ответ:
(х-4)(у+3)=ху+3х-4у-12
(m-2)(n-y)=mn+m(-1)y-2n+2y=mn-my-2n+2y=-my+mn-2n+2y
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Ответ:
(х-4)(у+3)=ху+3х-4у-12
(m-2)(n-y)=mn+m(-1)y-2n+2y=mn-my-2n+2y=-my+mn-2n+2y