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polinaporayko
@polinaporayko
September 2021
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Разложите на множители выражения:
a) 27 + a³
b) 0,64a² - x²
c) 27 - (m - l)³
d) 2k² + kx - 2kx -x²
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гюйс
Verified answer
27+а²=(3+а)(9-3а+а²)
0,64а²-х²=(0,8а+х)(0,8а-х)
27-(m-l)³=27-m³+m²l-3ml²+l³
или
3³-(m-l)³=(3-m+l)(9-3(m-l)+(m-l)²)=(3-m+l)(9-3m+3l+m²-2ml+l²)
2k²+kx-2kx-x²=2k(k-x)+x(k-x)=(2k+x)(k-x)
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Answers & Comments
Verified answer
27+а²=(3+а)(9-3а+а²)0,64а²-х²=(0,8а+х)(0,8а-х)
27-(m-l)³=27-m³+m²l-3ml²+l³ или 3³-(m-l)³=(3-m+l)(9-3(m-l)+(m-l)²)=(3-m+l)(9-3m+3l+m²-2ml+l²)
2k²+kx-2kx-x²=2k(k-x)+x(k-x)=(2k+x)(k-x)