1)0,2 - 2 (х+1)=0,4х 2) 2 (5х-7) (1+х)=0 3) х^2-10х=0 решите !

1) 0.2 - 2X - 2 = 0.4X

- 2X - 0.4X = - 0.2 + 2

- 2.4X = 1.8

X = - 0.75

2) (10X - 14)(1 + X) = 0

10X + 10X^2 - 14 - 14X = 0

10X^2 - 4X - 14 = 0

2(5X^2 - 2X - 7) = 0

D = 4 - 4*5*(-7) = 4 + 140 = 144 ; V D = 12

X1 = 2 + 12 \ 10 = 1.4

X2 = 2 - 12 \ 10 = - 1

3) X^2 - 10X = 0

X(X - 10) = 0

X - 10 = 0

X = 10

1. 0,2 - 2 (х+1)=0,4х

0,2 - 2*х +(- 2)*1 = 0,4х

0,2 - 2х +(- 2) = 0,4х

0,2 - 2х - 2 =0,4х

-2х - 0,4х = -0,2 + 2

-2,4х = 1,8

х= 18 : (-24)

х=  -0,75