Ответ:
1 (9х-1)(9х+1)=-1
3 (2х+7)(7-2х)=49-4х2-это степень
4 (-5х-1)2 =25х2+10х+1
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Ответ:
1 (9х-1)(9х+1)=-1
3 (2х+7)(7-2х)=49-4х2-это степень
4 (-5х-1)2 =25х2+10х+1