Ответ:
(х+2)(х-2) = х²-4
(2х-1)(2х+1)=4х²-1
(6-3х)(6+3х)= 36-9х²
(4+5х)(4-5х)= 16-25х²
(2х+3)²= 4х²+12х+9
(7-у)²=у²-14у+49
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Ответ:
(х+2)(х-2) = х²-4
(2х-1)(2х+1)=4х²-1
(6-3х)(6+3х)= 36-9х²
(4+5х)(4-5х)= 16-25х²
(2х+3)²= 4х²+12х+9
(7-у)²=у²-14у+49