Ответ:
г)(ab-1)(ab+1)=a²b²-2
(3-y)(3+y)=6-y²
(5b-9a)(5b+9a)=10b²-18a²
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Ответ:
г)(ab-1)(ab+1)=a²b²-2
(3-y)(3+y)=6-y²
(5b-9a)(5b+9a)=10b²-18a²