Question

1) 5 * (-x - 3y) -3 * (-1 2/3x + 0,5y) розкрийте дужки та зведіть подібні доданки 2) -3 1/3x = -20 ; -1 2/11 : x = 13/22 ; x : (-1,5) = -6 ; -x + 3,8 = 0,8

Answer 1

Ответ:

$1) 5 * (-x - 3y) -3 * (-1 \frac{2}{3}x + 0,5y)=-5x-15y+5x-1.5y=-16.5y$

$2) -3 \frac{1}{3}x = -20 \\\\x=-20:-3 \frac{1}{3}\\\\x=6\\\\\\\\-1 \frac{2}{11} : x = \frac{13}{22} \\\\x=\frac{13}{22}:-1 \frac{2}{11} \\\\x=0.5\\\\\\\\ x : (-1,5) = -6\\\\x=6*1.5\\\\x=9\\\\\\-x + 3,8 = 0,8\\\\-x=0.8-3.8\\\\x=3$