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Pomocy!!! Rozwiążcie zadanie:
A) 2x+3=7
B)x+2x+3+3x=15
C)x+2+x-4+x=18
D)2x+3-3x+2=4x-5
E)3x+4-x+5=x+20

Odpowiedź :

Paulinka529viz

A) 2x+3=7

2x = 7 + 3

2x = 10 /: 2

x = 5

B)x+2x+3+3x=15

x + 2x + 3x = 15 - 3

6x = 12 /: 6

x = 2

C)x+2+x-4+x=18

x + x + x = 18 - 2 + 4

3x = 20

x = 6,(6)7

D)2x+3-3x+2=4x-5

2x - 3x - 4x = - 3 - 5 - 2

-5x = - 10 /: (-5)

x = 2

E)3x+4-x+5=x+20

3x - x - x = 20 - 4 - 5

x = 11

10daysviz

A) 2x+3=7

2x = 7 - 3

2x = 4     /:2

x = 2

B)x+2x+3+3x=15

6x + 3 = 15

6x = 15 - 3

6x = 12         /:6

x = 2

C)x+2+x-4+x=18

3x - 2 = 18

3x = 18 + 2

3x = 20      / :3

x = [tex]\frac{20}{3}[/tex]

x = [tex]6\frac{2}{3}[/tex]

D)2x+3-3x+2=4x-5

-x + 5 = 4x - 5

-x -4x = -5 -5

-5x = -10          /:(-5)

x = 2

E)3x+4-x+5=x+20

2x + 9 = x + 20

2x - x = 20 - 9

x = 11

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