Ответ:
1) (4-с)(4+с)= 4^2-с^2=16-с^2
2) (7b+1)(1-7b)= (1+7b)(1-7b)= 1-49b^2
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Ответ:
1) (4-с)(4+с)= 4^2-с^2=16-с^2
2) (7b+1)(1-7b)= (1+7b)(1-7b)= 1-49b^2