Odpowiedzi

2010-04-12T17:30:42+02:00
A) 6x - 5 = 2x + 15
4x = 20 / :4
x = 5

b) 7x+1=5-2x
9x = 4 / :9
x = 4/9

c) -(x-1)=2(1+x)
-x + 1 = 2 + 2x
-3x = 1
x = -1/3

d)9(x-2)=0
9x - 18 = 0
9x = 18 / :9
x = 2
1 5 1