Ответ:
(b+5)²-b²-5=(b+5-b)(b+5+b)-5=5(2b+5)-5=10b+25-5=10b+20=10(b+2)
Удачи!
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Ответ:
(b+5)²-b²-5=(b+5-b)(b+5+b)-5=5(2b+5)-5=10b+25-5=10b+20=10(b+2)
Удачи!