Какое из выражений записанно верно ? A)a+bc-d(m+n)=ac+bc-dm-dn Б)(a+b)c-d(m-n)=ac-dm+bc+dn B)a+b(c-d)m+n=a+bmc-bdm+n Г) ( a+b)c-d(m+n)=ab+c-d+mn
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