Question

11, 12, 13, 14, 15, 16
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Answer 1

Răspuns:

Explicație pas cu pas:

11. a. 9(x-2)=-63

9x-18=-63

9x=-63+18

9x=-45

x=-5

2(4x+1)=2(5x-7)

8x+2=10x-14

8x-10x=-14-2

-2x=-16

x=8

1-4·[-5·(x-2)]=21

1-4·(-5x+10)=21

1+20x-40=21

20x=21+40-1

20x=60

x=3

5(x+3)=2(5x-5)

5x+15=10x-10

5x-10x=-10-15

-5x=-25

x=5

2(-x+5)=-8(3x+2)+56

-2x+10=-24x-16+56

-2x+24x=56-16-10

22x=30

x=30\22

12. 2x-3=5

2x=5+3

2x=8

x=4

2x-1=17

2x=16

x=8

2x+1=17

2x=17+1

2x=18

x=9

13. 7x-7=6-3(x+1)

7x-7=6-3x-3

7x+3x=-3+6+7

10x=10

x=1

3x-4=x+2(x-2)

3x-4=x+2x-4

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

0

5(1-2x)+1=4(x+3)+8

5-10x+1=4x+12+8

-10x-4x=8+12-1-5

-14x=14

x=-1