Question

Помогите, пожалуйста. алгебра 7 класс

Answer 1

$frac{10p}{p-q}+ frac{3p}{q-p} = frac{10p}{p-q}- frac{3p}{p-q} = frac{7p}{p-q}$
$frac{5a}{a-b}+ frac{5b}{b-a}= frac{5a}{a-b}- frac{5b}{a-b}= frac{5a-5b}{a-b} = frac{5(a-b)}{a-b}=5$
$frac{x-3}{x-1}- frac{2}{1-x}= frac{x-3}{x-1} + frac{2}{x-1}= frac{x-3+2}{x-1}= frac{x-1}{x-1}=1$
$frac{a}{2a-b} + frac{3a-b}{b-2a}= frac{a}{2a-b}- frac{3a-b}{2a-b}= frac{a-3a+b}{2a-b}= frac{b-2a}{2a-b} =- frac{2a-b}{2a-b} =-1$
$frac{a}{ a^{2}-9 }+ frac{3}{9- a^{2} } = frac{a}{ a^{2} -9}- frac{3}{ a^{2}-9 }= frac{a-3}{(a-3)(a+3)} = frac{1}{a+3}$
$frac{ y^{2} }{y-1}+ frac{1}{1-y}= frac{ y^{2} }{y-1}- frac{1}{y-1}= frac{ y^{2}-1 }{y-1}= frac{(y-1)(y+1)}{y-1}=y+1$