Question

va rog ajutati-ma dau coroană!!!​

Answer 1

Răspuns:

3x-5= 13

3x= 13+5

3x=18

x=18÷3

x=6

2)

4x+3=47

4x= 47-3

4x=44

x=11

3)

6x-1=2x+7

6x-2x= 7+1

4x=8

x=8÷4

x=2

4)

5x+2=26-3x

5x+3x=26-2

8x=24

×=24:8

x= 3

5)

7-8X=2x-23

7+23= 2x+8x

30= 10x

x =3

6)

9x-7=2( x+14)

9x-7=2x+28

9x-2x= 28+7

7x= 35

x=5

7)

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

4x-4=3x+15

4x-3x=15+4

x = 19

8)

2( x+3) +17=59

2x+6+17=59

2x= 59-17-6

2x= 42-6

2x= 36

x= 18

9)

5( x-1) +11=26

5x-5+11=26

5x= 26-11

5x-5=15

5x= 20

x=4

Answer 2

Le-am scris in ordine inversa, incepand cu exercitiul 20.

11*{x-2*[200+10*(24+24:4)]}=1210

11*{x-2*[200+10*(24+6)]}=1210

11*[x-2*(200+10*30)]=1210

11*[x-2*(200+300)]=1210

11*(x-2*500)=1210

11*(x-1000)=1210

11x - 11000 = 1210

11x=1210 + 11000

11x=12210

x=12210:11

x=1110

22-5x-7-3(x-2)=x+23

22-5x-7-(3x-6)=x+23

22-5x-7-3x+6=x+23

-5x-x=-22+7-6+23

-4x=23-22+7-6

-4x=1+7-6

-4x=8-6

-4x=2

x=2:(-4)

x=-2

(x+1)+(x+2)+(x+3)+(x+4)=21 + 2x

x+x+x+x+1+2+3+4=21 +2x

4x + 10=21+2x

4x-2x=21-10

2x=11

x=11:2

7x+3(x-2)+6=x+36

7x+3x-6+6=x+36

10x=x+36

10x-x=36

9x=36

x=36:9

x=4

2(x+1)+3(x+2)+4x=35

2x+2+3x+6+4x=35

2x+3x+4x=35-2-6

9x=27

x=27:9

x=3

x+2x+3x+4x=120

10x=120

x=120:10

x=12

2x+7(x+1)+5=3x+24

2x+7x+7+5=3x+24

2x+7x-3x=24-7-5

9x-3x=12

6x=12

x=2

3(x+1)+2x+3=4x+7

3x+3+2x+3=4x+7

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

5x-4x=1

x=1

9(x-3)-23=22

9x-27-23=22

9x=22+27+23

9x=72

x=8

2+3(x+1)=10

2+3x+3=10

3x=10-2-3

3x=5

x=5:3

2(2x-3)-9=1

4x-6-9=1

4x=1+6+9

4x=16

x=4

5(x-1)+11=26

5x-5+11=26

5x=26+5-11

5x=31-11

5x=20

x=4

2(x+3)+17=59

2x+6+17=59

2x=59-6-17

2x=36

x=18

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

4x-4=3x+15

4x-3x=4+15

x=19

9x-7=2(x+14)

9x-7=2x+28

9x-2x=28+7

7x=35

x=5

7-8x=2x-23

-8x-2x=-23-7|inmultim cu (-1)

8x+2x=23+7

10x=30

x=3

5x+2=26-3x

5x+3x=26-2

8x=24

x=3

6x-1=2x+7

6x-2x=1+7

4x=8

x=2

4x+3=47

4x=47-3

4x=44

x=11

3x-5=13

3x=13+5

3x=18

x=6