Question

Rapid ex 2 si 3 ! Va rog!

Answer 1

Răspuns: A) 3(2x+8)= -6

6x+24= -6

6x= -30

x= -30:6

x=-5

B) 5x+4=2x-8

5x-2x= -8-4

3x= -12

x= -12:3

x= -4

C) 4(2-x)= x-2

8-4x= x-2

-4x-x= -2-4

-3x= -6

-x= -2/ (x-1)

x=2

3) 2[21-3(5-2x)] =0

2(21-15+6x)=0

42-30+12x=0

12x= -42+30

12x= -12

x= -1

Answer 2

2.

a) 3(2x+8)=-6

6x+24=-6

6x=-6-24

6x= -30

x=-30:6

x=-5

b)5x+4=2x-8

4-8=5x-2x

-4=3x

x=3:(-4)

x=1

c)4(2-x)=x-2

8-4x=x-2

8+2=4x+x

10=5x

x=10:5

x=2

3.

2[21-3(5-2x)]=0

2(21-15-6x)=0

2(6-6x)=0

12-12x=0

12x=12-0

12x=12

x=12:12

x=1