Question

100БАЛЛОВ
Решить
5x-4=7
6x-3x+1=8
8-3/5x=17
Упростить
4x-7-(6x-8x)

​

Answer 1

$1. \5x - 4 = 7\5x = 7 + 4\5x = 11\x = frac{11}{5} \x = 2,2\ \ OTBET: 2,2$

$2. \ 6x - 3x + 1 = 8\ 3x + 1 = 8\ 3x = 8 - 1\ 3x = 7\ x = frac{7}{3} \ x = 2 frac{1}{3} \\ OTBET: 2 frac{1}{3}$

$3. \ 8-frac{3}{5}x=17\ \ -frac{3}{5}x = 17 - 8\ \ -frac{3}{5}x = 9\ \ x = 9 : (-frac{3}{5})\ \ x = -frac{9cdot5}{3} \ \ x=-15\ \ OTBET: -15$

$4.\ 4x-7-(6x-8x)=4x-7-(-2x)=4x-7+2x=6x-7\\OTBET:6x-7$