Ответ:
cd-cb+2d-2b=(cd-cb)+(2d-2b)=c(d-b)+2(d-b)=(d-b)(c+2)
y^2-49=(y-7)(y+7)
8ab+4a=4a(2b+1)
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Ответ:
cd-cb+2d-2b=(cd-cb)+(2d-2b)=c(d-b)+2(d-b)=(d-b)(c+2)
y^2-49=(y-7)(y+7)
8ab+4a=4a(2b+1)