Odpowiedzi

2010-04-12T16:22:55+02:00
-7-1=5x -8=5x/:5 x=1,6
7x-5x=21 2x=21 x=10.5
8x=33 x=4,125
-10x+2x=-5 -8x=-5/:-8 x=0,625
2010-04-12T16:24:47+02:00
A)-7=5x+1
-5x=7+1
-5x=8 / :(-5)
x= -1 ⅗


b) 7x-21=5x
7x -5x=21
2x=21 / :2
x=10 ½


c) 33-4x=4x
-4x-4x=-33
-8x=- 33 / : (-8)
x= 4 ⅛

d) 5-10x= -2x
-10x +2x = -5
-8x=-5 / :(-8)
x= ⅝