Odpowiedzi

2009-10-26T09:09:38+01:00
Ze wzorow skroconego mnozenia
40(x-3)-(x+1)(x-1)=5(x-1)-(x+3)²-2
40x-120-x²+1=5x-5-(x²+6x+9)-2
40x-x²-120+1=5x-5-x²-6x-9-2
40x-x²+x²-5x+6x=120-1-9-2-5
41x=103
x=103/41
2009-10-26T09:11:16+01:00
4(X-3)-(X+1)(X-1)=5(X-1)-(X+3)²-2
4x-12-(x²-1²)=5x-5-(x²+2*x*3+3²)-2
4x-12-x²+1=5x-5-x²-6x-9-2
4x-x²-5x+x²+6x=-5-9-2+12-1
5x=-5 /5
x=-1
Pozdrawiam:)
2009-10-26T10:15:37+01:00
4x-12 -x2 +1=5x-5- x2- 6x-9-2
4x-11-x2= -x-16-x2
5x= -5
x=-1