Question

- ..2x-3=5 1/4
................5

Answer 1

$- frac{2x-3}{5} = 5 frac{1}{4} \ \ - frac{2x-3}{5} = frac{21}{4} \ \ -4(2x-3) = 21*5 \ \ - 8x +12 =105 \ \ -8x= 105-12 \ \ -8x= 93 \ \ x=93: (-8) \ \ x= -11.625$

Проверим:
$- frac{2* (-11,625) -3}{5} = 5 frac{1}{4} \ \ - frac{-26,25}{5} = 5 frac{1}{4} \ \ - ( -5,25) = 5 frac{1}{4} \ \ 5,25=5,25$

Answer 2

вот даю много балов http://znanija.com/task/18634595