(-8mn-28m-16n-56)+(-63-81n+18+14m)=-8mn-28m-16n-
56-63-81n+18+14m=-8mn-14m+65n-101
(4m+8)(-2n-7)+(7m+9)(-9n+2)
-8mn-28m-16n-56-63mn+14m-81n+18
-71mn-14m-97n-38
Объяснение:
(-8mn-28m-16n-56)+(-63-81n+18+14m)=-8mn-28m-16n-
56-63-81n+18+14m=-8mn-14m+65n-101