Question

va rog sa se calculeze eculatile in mulțimea Z
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Answer 1

Răspuns:

1) 5x+5=5

5x=5-5

5x=0 x=0

2)6x-10=5x+10

6x-5x=10+10

x=20

3) 10x-9=12x+8

10x-12x=8+9

2x=17

x=8,5

4)6x-4=5-3x

6x+3x=5+4

9x=9

x=1

5)5x=-30

x=-30:5=-6. x=-6

6)-7x=-21

7x=21. x=21:7=3

7)5x+2-3x+4=8

2x=8-6. 2x=2. x=1

8)20x+25=10x-4

20x-10x=-4-25

10x=-29

x=29:10=2,9