Question

rezolvati ecuatiile:6

Answer 1

a) 2x-7 = 13

2x = 13+7

2x = 20

x = 20:2

x = 10

b) -7+6x = 4x+15

6x-4x = 15+7

2x = 22

x = 22:2

x = 11

c) 5x-11 = x-3

5x-x = -3+11

4x = 8

x = 8:4

x = 2

d) 2,5x-4,7 = 3(1,5x+2)

2,5x-4,7 = 4,5x+6

2,5x-4,5x = 6+4,7

-2x = 10,7

x = 10,7:(-2)

x = -5,35

e) 3x-5+4x = 18

7x = 18+5

7x = 23

x = 23/7

f) 8x+20 = 3x

8x-3x = -20

5x = -20

x = -20:5

x = -4

g) 10x-30 = 24x+28-2

10x-30 = 24x+26

10x-24x = 26+30

-14x = 56

x = 56:(-14)

x = -4

h) (2+V3)x = 2-V3

x = (2-V3)/(2+V3) raționalizezi cu 2-V3

x = (4-4V3+3)/(4-3)

x = 7-4V3

i) V3x+4 = 1-2V3x

V3x+2V3x = 1-4

3V3x = -3

V3x = -1

x = -1/V3 raționalizezi cu V3

x = -V3/3