Question

Решите уравнение:
а)3/5x=-9/10=
б)-4/7y=8/21=
в)-5/9x=-1 13/27=
г)-2/3y+5=2 5/9​

Answer 1

Ответ:

а)1,5

б)-2/3

в)7

г)5/6

АААААААААААААА

Answer 2

$1)\frac{3}{5}x = -\frac{9}{10}\\\\\frac{3}{5}x*10 = -\frac{9}{10} *10\\\\3x*2 = -9\\6x=-9\\x= -\frac{9}{6} = -\frac{3}{2} = -1,5$

$2)-\frac{4}{7}y = \frac{8}{21} \\\\-\frac{4}{7}y*21 = \frac{8}{21}*21\\\\-4y*3 = 8\\-12y=8\\y=-\frac{8}{12}= -\frac{2}{3}$

$3)-\frac{5}{9}x = -1\frac{13}{27} \\\\-\frac{5}{9}x =- \frac{40}{27} \\\\-\frac{5}{9}x*27 =- \frac{40}{27}*27\\\\-5x*3=-40\\-15x=-40\\x=\frac{-40}{-15} = \frac{8}{3} = 2\frac{2}{3}$

$4)-\frac{2}{3}y+5=2\frac{5}{9}\\\\-\frac{2}{3}y*9+5*9=\frac{23}{9} *9\\\\-2y*3+45= 23\\-6y=23-45\\-6y=-22\\y=\frac{-22}{-6} = \frac{11}{3}$