Tuesday, March 25, 2014

Հավասարումներ

1) 2(x-2,5)=-13
2x-5=-13
2x=-8
x=-4

2) =x
x2=2
x=√2
3) |x|=-x
x €  ø

4) |x-1|=5
x-1=5   x-1=-5
x=6      x=-4

5) =2
=2
7x-21=2x-2
5x=19   

6) 5(x+2)=2(x+5)
5x+10=2x+10
3x=0
x=0

7)
(3x-5)4=7x-5
12x-20=7x-5
5x=15
x=3

8) =-6
7x+12=6(9x-2)
7x+12=-54x+12
61x=0
x=0

9) =1
4x-7=2x+1
2x=8
x=4

10) |2- x|=3
2- x=3
8-3x=12
-3x=-4
x=
8-3x=-12
-3x=-20
x=

11) 6-18x<3(x-1)-7(3x-2)
6-18x<3-3-21x+14
6-18x<-18x+11
0<5    ø


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