Odpowiedzi

2009-11-24T20:33:52+01:00

a) x-3/3 - 1/6x=5/6 - x+5/3 |*6
6x-6-x=5-6x+10
5x-6=15-6x |+6x
11x-6=15 |+6
11x=21
x=21/11


b) 3x-5/3x-1 =x-5/x-2 |*6
18x-10x-6=6x+15
8x-6=6x+15
2x=21
x=10,5



c) (x+4)² - (x-3)²= -7
x²+8x+16-x²-6x+9=-7
2x+15=-7
2x=-22
x=-11