Question

выполните сложение или вычитание 
а)x/y^2+2/y
б)2x/y-x/y^2
в)1-a/a^2+1/a
г)x+a/x^2+x-a/ax
д)y+b/y^2+y+b/by
е)a-2b/ab^2-b-2a/a^2b
ж)c-d/c^2d-c+d/cd^2
з)a^2-b^2/b^5+2/b^3
и)x^3+1/x^7-1/x^4

Answer 1

$frac{x}{y^2}+ frac{2}{y}= frac{x+2y}{y^2} \ frac{2x}{y} - frac{x}{y^2}= frac{2xy-x}{y^2} \ 1- frac{a}{a^2}+ frac{1}{a}= 1- frac{1}{a}+ frac{1}{a}=1 \ x+ frac{a}{x^2} +x- frac{a}{ax}=2x+ frac{a}{x^2} - frac{x}{x^2}=frac{2x^3+a-x}{x^2} \ y+ frac{b}{y^2} +y+ frac{b}{by} =2y+ frac{b}{y^2} + frac{y}{y^2} = frac{2y^3b+y}{y^2}$
$a- frac{2b}{ab^2}-b- frac{2a}{a^2b}=a-b- frac{2}{ab}- frac{2}{ab}= frac{a^2b-ab^2-4}{ab} \ c- frac{d}{c^2d}-c+ frac{d}{cd^2}= frac{1}{cd}- frac{1}{c^2}= frac{c-d}{c^2d} \ a^2- frac{b^2}{b^5} + frac{2}{b^3}=a^2- frac{1}{b^3} + frac{2}{b^3}= a^2+ frac{1}{b^3}= frac{a^2b^3+1}{b^3} \ x^3+ frac{1}{x^7}- frac{1}{x^4} = frac{x^{10}+1-x^3}{x^7}$