360+(х:3)=440; (х+25)*4=360;(х:8)*140=212

Ответ:

1) 240;

2) 65;

$3) 12\displaystyle\frac{4}{35}$

Пошаговое объяснение:

$1)360 + \displaystyle\frac{x}{3} =440\\\\\frac{1080+x}{3} =440\\\\1080+x=440*3\\1080+x=1320\\x=1320-1080\\x=240$

2) (x + 25) * 4 = 360

4x + 100 = 360

4x = 360 - 100

4x = 260

$x=\displaystyle\frac{260}{4} =65$ ;

$3)\displaystyle\frac{x}{8}*140=212\\\\\\\frac{35x}{2} =212\\\\\displaystyle35x = 212*2\\35x=424\\\\x=\frac{424}{35} =12\frac{4}{35}$