Question

2. Rezolvaţi în R:
a) 2x+7=3x-2
b) 7x+3-3x=4x+3
c)2+6(4x-2)=9-5(2x+3)
d) 25-4(2x-3)=16+(5x-4)2
e) 2x-5+8x=10x+8
f) 5-3x=8%+2
g) 5+3(10x+5)=4-3(8%-2)
h)3(x+2)-2(1-x)=4x+5

Answer 1

Răspuns:

a) 2x-3x=-2-7

-x = -9

x = 9

b) 7x-4x-3x=3-3

7x-7x=3-3

0=0

c) 2+6(4x-2)=9-5(2x+3)

2+24x-12=9-10x-15

24x-10=-10x-6

24x+10x=10-6

34x=4

x=34/4

d)25-4(2x-3)=16+(5×-4)2

25-8x-12=16+10x-8

13-8x=8+10x

-10x-8x=8-13

-18x=5

x=5/-18

e)2x-5+8x=10x+8

10x-5=10x+8

10x-10x=8+5

0 . x= 15(ec fără sens)

f)5-3x=8x+2

-8x-3x=2-5

-11x=-3

×= 3/11

g)5+3(10x+5)=4-3(8x-2)

5+30x+15=4-24x+6

30x+20=-24x+10

30x+24x= 10-20

54x=-10

x=-10/54

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

3x+6-2+2x=4x+5

5x+4=4x+5

5x-4x=5-4

x=1