Ответ: -28m+5.
Объяснение:
(7m-2)²-(7m-1)(7m+1)=49m²-28m+4-(49m²-1)=
=49m²-28m+4-49m²+1= -28m+5.
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Ответ: -28m+5.
Объяснение:
(7m-2)²-(7m-1)(7m+1)=49m²-28m+4-(49m²-1)=
=49m²-28m+4-49m²+1= -28m+5.