Решите уравнения x2 +6=5x 2-3(2x+2)=5-4x -2(5-3x)=7x+3 1-2(5-2x)=-x-3

Question

Решите уравнения x2 +6=5x
2-3(2x+2)=5-4x
-2(5-3x)=7x+3
1-2(5-2x)=-x-3

Answer 1

2-3(2х+2)=5-4х
2-6х-6=5-4х
-6х+4х=5-2+6
-2х=9
х=-9÷2
х=-4.5

-2(5-3х)=7х+3
-10+6х=7х+3
6х-7х=3+10
-х=13
х=-13

1-2(5-2х)=-х-3
1-10+4х=-х-3
4х-9=-х-3
4х+х=-3+9
5х=6
х=6÷5
х=1.2

Comments

х^2+6=5х. х^2-5х+6=0. Д=25-4×1×6=1. х1=(5-1)/2=2. х2=(5+1)/2=3

Answer 2

Х2+6=5х
6=5х-2,х
6=3,х
х=6/3
х=2