Ответ

Автор - HIPM

Объяснение:

 frac{a - x}{b - a}  -  frac{x + a}{a - b}  =  frac{2ax}{ {a}^{2}  -  {b}^{2} }  \  frac{a - x + x + a}{b - a}  =  frac{2ax}{ {a}^{2}  -  {b}^{2} }  \ 2a(a - b)(a + b) = 2ax(b - a) \ 2a(a + b) =  - 2ax \  - x = a + b

Ответ

Проверено экспертом

Автор - Universalka

frac{a-x}{b-a}-frac{x+a}{a-b}=frac{2ax}{a^{2}-b^{2}} \\frac{a-x}{b-a}+frac{x+a}{b-a}=frac{2ax}{a^{2}-b^{2}}\\frac{a-x+x+a}{b-a}=frac{2ax}{a^{2}-b^{2}}\\frac{2a}{b-a}-frac{2ax}{(a-b)(a+b)}=0\\frac{2a}{b-a}+frac{2ax}{(b-a)(a+b)}=0\\frac{2a^{2}+2ab+2ax}{(b-a)(a+b)}=0\\left { {{2a^{2}+2ab+2ax=0 } atop {b-aneq0;a+bneq0}} right. \\2ax=-2a^{2}-2ab\\x=-frac{2a^{2}+2ab}{2a}=-(a+b)

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