(b+c)²-b(b-2c)=b²+2bc+c²-b²+2bc=4bc+c²
Ответ..................................................ответ
<span>21х-7ху+21у-7у²=7х(3-у)+7у(3-у)=(3-у)(7х+7у)=(3-у)*7*(х+у)
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а²-10а+25-4р⅔= (а-5)² -(2∛р)² = (а-5 - 2∛р )(а-5 + 2∛р)<span>
4b²+2b+c-c² = (</span>4b²-c²)+( 2b+c) =(2b-c)(2b+c) +(2b+c) =(2b+c)*(2b-c+1)
7y³+35y² = 7y²(y+5)=0
7у²=0 у+5=0
y=0 у=-5