Ответ:
(7-5b)(7b+5)+7b(5b-7)=49b+35-35b²-25b+35b²-49b=-25b+35
b=1,5; -25·1,5+35=-2,5
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Ответ:
(7-5b)(7b+5)+7b(5b-7)=49b+35-35b²-25b+35b²-49b=-25b+35
b=1,5; -25·1,5+35=-2,5