Question

помогите плииз решить уравнение1) y-5/6=4/3 2) 5/6=15/2х-3 3)2/5= 6/х+3 4) 12:4/5х=20:1/4

Answer 1

$1)y- frac{5}{6} = frac{4}{3} \ y= frac{4}{3} + frac{5}{6} \ y= frac{8}{6} + frac{5}{6} \ y= frac{13}{6} = 2frac{1}{6} \ \ 2) frac{5}{6} = frac{15}{2}x -3 \ 3+ frac{5}{6} = frac{15}{2}x \ 3frac{5}{6} = frac{15}{2}x \ frac{18+5}{6} = frac{15}{2}x \ frac{18}{6} : frac{15}{2}=x \ frac{18}{6} *frac{2}{15}=x \ frac{2}{3}=x$
$3) frac{2}{5} = frac{6}{x} +3 \ frac{2}{5}-3=frac{6}{x} \ frac{2-15}{5}=frac{6}{x} \ frac{2-15}{5}=frac{6}{x} \ -13x=30 \ x=- frac{13}{30}$

$4)12: frac{4}{5} x=20: frac{1}{4} \ 12* frac{5}{4} =20x* frac{4}{1} \ 15=80x \ x= frac{15}{80} \ x= frac{3}{16}$