Question

ПОМОГИТЕ ПОЖАЛУЙСТА, 1 И 3

Answer 1

$frac{4x+y}{10}+ frac{6x-5y}{4}-x= frac{2(4x+y)+5(6x-5y)-20x}{20} = frac{8x+2y+30x-25y-20x}{20}=$$frac{18x-23y}{20}$

$frac{5a^{2} }{ab-2b^{2} }- frac{10a}{a-2b} = frac{5a^{2} }{b(a-2b)}- frac{10a}{a-2b}= frac{5a^{2}-10ab }{b(a-2b)}= frac{5a(a-2b)}{b(a-2b)}= frac{5a}{b}$