помогите пожалуйста . 5 класс. Created by MariaKotunova. algebra-ru

помогите пожалуйста . 5 класс...

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1)2/[(1-x)(1+x)] -2/(1-x)²=(2-2x-2-2x)/[(1-x)²(1+x)]=-4x/[(1-x)²(1+x)]
2)-4x/[(1-x)²(1+x)]*(1-x)²=-4x(1+x)
3)-4x/(1+x)-4/(1+x)=-4(x+1)/(1+x)=-4

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lara164

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1) $( \frac{2}{(1-x)(1+x)} - \frac{2}{(1-x)^2})= \frac{2(1-x)-2(1+x)}{(1-x)^2(1+x)} =$ =
= $\frac{2-2x-2-2x}{(1-x)^2(1+x)} = \frac{-4x}{(1-x)^2(1+x)}$
2) $\frac{-4x}{(1-x)^2(1+x)} *(1-x)^2= \frac{-4x}{(1+x)}$
3) $\frac{-4x}{(1+x)} - \frac{4}{1+x} = \frac{-4x-4}{1+x} = \frac{-4(x+1)}{1+x} =-4$

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