Odpowiedzi

2009-03-26T19:18:45+01:00
1) 3y + 8 = y + 15y
8=13y
y=8/13

2) 2x + 5 = x + 13
x=8

3) 3x + 5 = 7x + 3
2=4x
x=0,5

4)9r + 4 = 19r
4=10r
r=0,4

5) x + 2 = 2x + 1
x=1
2009-03-26T19:19:44+01:00
1) 3y + 8 = y + 15y
8 = 16y - 3y
8= 13y |:13
y= 8/13
2) 2x + 5 = x + 13
2x - x = 13 - 5
x = 8

3) 3x + 5 = 7x + 3
3x - 7x = 3 - 5
-4x = -2 | : (-4)
x = 2/4= 1/2

4)9r + 4 = 19r
9r - 19r = - 4
-10r = -4|:(-10)
r= 4/10 = 2/5


5) x + 2 = 2x + 1
x - 2x = 1 - 2
-1x = -1 | :(-1)
x = 1


2009-03-26T19:20:44+01:00
1) 3Y-16Y=(-8)
-13Y=(-8) I-13
y=13/8
2) x=8
3)-4x= (-2) I-4
x=(1/2)
4)(-10r)=4 I(-10)
r= -2,5
5)-x=-1I-1
x=1
2009-03-26T19:23:51+01:00
1)3y+8=y+15
3y+8=16y
8=16y
y=0,5
2)2x+5=x+13
x+5=13
x=8
3)3x+5=7x+3
5=4x+3
2=4x
x=0,5
4)9r+4=19r
4=10r
r=0,4
5) x+2=2x+1
x=1