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5. Rozwiąż równania.
a) 2x +8=16
b) 48-7=X+9
c) 3(x + 2) = 2x - 7​


Odpowiedź :

a)

2x+8=16|-8

2x=8|÷2

x=4

b)

48-7=x+9

41=x+9|-9

32=x

c)

3(x+2)=2x-7

3x+6=2x-7|-6

3x=2x-13|-2x

x=-13

A

2x + 8 = 16 / - 8

2x = 16 - 8

2x = 8 / :2

x = 4

B

48 - 7 = x + 9 / -9

48 - 7 - 9 = x

x = 32

C

3(x + 2) = 2x - 7

3x + 6 = 2x - 7 / -6

3x = 2x - 13 / -2x

3x - 2x = -13

x = - 13