Question

Rezolvaţi în N:
a) 7x=2x+10; b) 5x-3-2x+9;
c)9x-3-7x+5; d) 3x-5+2x = 4x+7;
e) 3(x+2) = x+14;
g) 3•(x+1)+2(x+2=4x+10;
h) 8x+4(2x+1)-6x=4x+16;​

Answer 1

Răspuns:

a) 7x =2x +10

7x-2x=10

5x=10

x=10÷5

x=2

b) 5x-3=2x+9

5x-2x=9+3

3x=12

x=12÷4

x=3

c) 9x-3=7x+5

9x-7x=5+3

2x=8

x=8÷2

x=4

d) 3x-5+2x=4x+7

3x+2x-4x=7+5

5x-4x=12

x=12

e) 3(x+2)=x+14

3x+6=x+14

3x-x=14-6

2x=8

x=4

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

3x+3+2x+4=4x+10

3x+2x-4x=10-3-4

5x-4x=7-4

x=3

h) 8x+4(2x+1)-6x=4x+16

8x+8x+4-6x=4x+16

16x-6x-4x=16-4

10x-4x=12

6x=12

x=12÷6

x=2