Question

решите 142 и 149 пожалуйста:3

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Answer 1

142.

$(\frac{c}{b-c}-\frac{c}{b}):\frac{c^2}{b^2};\\(\frac{bc-c(b-c)}{b(b-c)})*\frac{b^2}{c^2};\\\frac{c(-b+c+b)}{b(b-c)}*\frac{b^2}{c^2};\\\frac{c^2*b^2}{b(b-c)*c^2};\\\frac{b}{b-c}\\1-b/c$

149.

$\frac{x}{a}-\frac{x^2-a^2}{a^2}*\frac{a}{x+a};\\\frac{x}{a}-\frac{(x+a)(x-a)}{a(x+a)};\\\frac{x}{a}-\frac{x-a}{a}\\\frac{x-x+a}{a}\\a/a\\1$