Question

va rog ajutati-ma!plzzzzzzzz

Answer 1

Răspuns:

a) x =-5

b) x = -8

c) x = - 3

d) x = 3

e) x = 2

f) x = - 1

g) x = 10

h) x = 1

i) x = - 1

j) x = 2

k) x = 3/2

l) x = 2 sau x = - 4

m) x = 8

n) x = 8/3

o) x = -2 sau x = 8

Explicație pas cu pas:

a)

2x+3= -7

2x= -7 -3

2x = -10

x = -10÷2

x = -5

b)

9 - 2x = - 31 - 7x

-2x + 7x = - 31 - 9

5x = - 40

x = -8

c)

7 - 2 x = - 23 -12x

- 2x + 12 x = -23 -7

10x = - 30

x = - 3

d)

3 ( x - 1) = 6 / ÷3

x - 1 = 2

x = 2 + 1

x = 3

e)

3 (x+1) = 11 - x

3x + 3 = 11 - x

3x + x = 11 - 3

4x = 8

x = 2

f)

1-4(2x-1) = 3(x+2)+10

1-8x+4=3x+6+10

5-8x=3x+16

-8x-3x=16-5

-11x=11

x = -1

g)

2(x+2)=3x-6

2x+4=3x-6

2x-3x=-6-4

-x=-10

x=10

h)

4x+2=3x+3

4x-3x=3-2

x=1

i)

3-5(2x-1)=4(x+2) +14

3-10x+5=4x+8+14

8-10x=4x+22

-10x-4x=22-8

-14x=14

x= -1

j)

8x-16=0

8x=16

x=16÷8

x=2

k)

5+x-2=x+3

3x=x+3

3x-x=3

2x=3

x=3/2

l)

|x+1|=3

x+1=3

x+1=-3

x=2

x=-4

m)

-4x+2= -30

-4x= -30 -2

-4x = -32

x = -32 ÷ (-4)

x = 8

n)

2(x+1)=10-x

2x+2=10-x

2x+x=10-2

3x=8

x= 8/3

o)

2+|x-3|=7

|x-3|=7-2

|x-3|=5

x-3=5

x-3= -5

x=8

x= -2