Odpowiedzi

2009-12-20T13:49:48+01:00
A) |2x-8|=10
-10=2x-8=10 /+8
-10+8=2x=10+8
-2=2x=18 /:2
-1=x=9
x=-1
x=9

b) |-3x+6|=24
-24=-3x+6=24 /-6
-24-6=-3x=24-6
-30=-3x=18 /:(-3)
10=x=-6
x=-6
x=10

2009-12-20T13:52:27+01:00
A)
|2x - 8| = 10
2x - 8 = 10
2x = 18
x = 9

-2x + 8 = 10
-2x = 2
x = -1

Spr:
|18 - 8| = |10| = 10
|-2 - 8| = |-10| = 10


B)
|-3x + 6| = 24
-3x + 6 = 24
-3x = 18
x = -6

3x - 6 = 24
3x = 30
x = 10
2009-12-20T13:56:10+01:00
|2x-8|=10 v-lub
2x-8=10 v 2x-8=-10
2x=18 v 2x=-2
x=9 v x=-1

|-3x+6|=24
-3x+6=24 v -3x+6=-24
-3x=18 v -3x=-30
x=-6 v x=10