Odpowiedzi

2009-12-10T23:03:29+01:00
A) { x/2+y/2=1 1/3 /x6
x/3-y/2=2 1/3 /x6

3x+3y=8
+2x-3y=14
-------------
5x=22
x=4,4
y=1 11/15

b) { x+2/5 - 2y=5 /x5
x- y+2/6=3 /x6

5x+2-10y=25
6x-6y+2=18

5x-10y=23 /x6
6x-6y=16 /x-5

30x-60y=138
-30x+30y=-96
--------------
30y=42
y=1,4
x=7,4

c) { x+y/2-x/3=4 /x6
x-y/2+y/3=-3 /x-6

4x+3y=24
-6x+y=18 /x-3

4x+3y=24
18x-3y=-54
--------------------
22x=-30
x=-1 8/22
y=6 6/33




2009-12-10T23:05:36+01:00
X/2+y/2=1 1/3
x/3-y/2=2 1/3

½x+½y=1⅓ /*6
⅓x-½y=2⅓ /*6

3x+3y=8
2x-3y=14
3x+3y=8
+2x-3y=14
_____________
5x=22
x=4,4
y=1 11/15

b)
x+2/5 - 2y=5 /*5
x- y+2/6=3 /*6

5x+2-10y=25
6x-6y+2=18

5x-10y=23 /x6
6x-6y=16 /x-5

30x-60y=138
-30x+30y=-96
____________
30y=42
y=1,4
x=7,4

c)
x+y/2-x/3=4 /x6
x-y/2+y/3=-3 /x-6

4x+3y=24
-6x+y=18 /x-3

4x+3y=24
18x-3y=-54
_______________
22x=-30
x=-1 8/22
y=6 6/33