Question

1. Rezolvați următoarele ecuații:
a) 3x– 8 = x +10 d) 8x- 7 = x+14 g) 4x – 12= 2x + 14
b) 4x– 5= x + 7 e) 6x+ 9= 8x–11 h) 7x + 16 = 3x – 12
c) 6x –12 = 3x + 15 f) 9x + 8= 7x – 4 i) 15 x – 25 = 5x + 15

Answer 1

Răspuns:

a) 3x-8=x+10

3x-x=10+8

2x=18

x=18/2=9

b) 4x– 5= x + 7

4x+x=7+5

3x=12

x=12/3=4

c) 6x –12 = 3x +15

6x -3x=15+12

3x=27

x=27/3=9

d) 8x - 7= x +14

8x - x =14+7

7x =21

x21/7=3

e) 6x + 9 =8x -11

6x - 8x= - 11 -9

- 2x = -20

x = 10

f) 9x +8 = 7x - 4

9x - 7x= -4 -8

2x = -12

x=-6

g) 4x-12=2x +14

4x -2 x =14+12

2x= 26

x=26/2=13

h) 7x +16 = 3x -12

7x -3x =-16 -12

4x =-28

x=-7

i) 15x -25= 5x + 15

15x -5x =25+15

10 x =40

x 40/10=4

Answer 2

Răspuns:

Explicație pas cu pas: