Question

Срочно!!!
20баллов.

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Answer 1

Ответ:

Формулы:   $\boxed{\ (m\pm n)^3=m^3\pm3m^2n+3mn^2\pm n^3\ }$

$24)\ \ (5a^4+?)^3=?+?+?+\underbrace{8b^{12}}_{(2b^4)^3}\\\\\\ (5a^4+2b^4)^3=(5a^4)^3+3\cdot (5a^4)^2\cdot 2b^4+3\cdot 5a^4\cdot (2b^4)^2+(2b^4)^3=\\\\{}\qquad \qquad \ =125a^{12}+150a^8b^4+60a^4b^{8}+8b^{12}\\\\\\25)\ \ (?-2x)^3=\underbrace{z^6}_{(z^2)^3}-?+?-?\\\\\\(z^2-2x)^3=(z^2)^3-3(z^2)^2\cdot 2x+3z^2\cdot (2x)^2-(2x)^3=z^6-6z^4x+12z^2x^2-8x^3$

$26)\ \ (?+4)^3=?+?+\underbrace{240a^5}_{3\cdot 5a^5\cdot 4^2}+?\\\\\\(5a^5+4)^3=(5a^5)^3+3\cdot (5a^5)^2\cdot 4+3\cdot 5a^5\cdot 4^2+4^3=\\\\{}\qquad \qquad \ =125a^{15}+300a^{10}+240a^5+64$