Question

срочно 2 столбик , прошу

Answer 1

№146
$frac{c-3}{c} - frac{c^2-9}{c} * frac{1}{c-3} = frac{c-3}{c} - frac{(c-3)(c+3)}{c} * frac{1}{c-3}= frac{c-3}{c} - frac{c+3}{c}= frac{c-3-c-3}{c}=$ $- frac{6}{c}$
№147
$frac{a-1}{a^2} * frac{ax-a}{a-1} + frac{1-x}{2a}= frac{a-1}{a^2} * frac{a(x-1)}{a-1} + frac{1-x}{2a}= frac{x-1}{a} + frac{1-x}{2a}= frac{2x-2+1-x}{2a}=$ $frac{x-1}{2a}$
№148
$frac{x^2-xy}{y-1} * frac{y-1}{ x^{2} } + frac{y-x}{2x} = frac{x(x-y)}{y-1} * frac{y-1}{ x^{2} } + frac{y-x}{2x} = frac{x-y}{x}+ frac{y-x}{2x}= frac{2x-2y+y-x}{2x}=$ $frac{x-y}{2x}$
№149
$frac{x}{a} - frac{x^2-a^2}{a^2}* frac{a}{x+a} = frac{x}{a} - frac{(x-a)(x+a)}{a^2}* frac{a}{x+a} = frac{x}{a} - frac{x-a}{a}= frac{x-x+a}{a}= frac{a}{a} =1$