Question

Помогите пожалуйста

Answer 1

Ответ:

$4. \\ 7 - 4x - 3x - 2 = 12 \\ - 7x = 12 - 5 \\ x = - 7 \\ \\ \frac{x}{3} + \frac{x}{2} = 15 \\ \frac{2x}{6} + \frac{3x}{6} = 15 \\ \frac{5x}{6} = 15 \\ 5x = 15 \times 6 \\ 5x = 90 \\ x = 18$

1.x²+x-2=0

D=1+8=9

x=-1+3/2=1 или x=-1-3/2=-2

2. a) 3/4x=12

x=16

b) 9-0,2x=1

-0,2x=-8

x=40

v) 6x-1=2x-9

4x=-8

x=-2