Odpowiedzi

2009-12-15T16:20:58+01:00
15b=15b

a²+b²=a²-b²+4ab
2b²=4ab

2x+x²-2x-4=2x²-2-x²+9
-2x²=-11
2009-12-15T16:22:12+01:00
3×5b=3b×2+9b
15b = 15b

(a+b)²=(a-b)²+4ab
2b²=4ab

2x+(x-2)(x+2)=2(x-1)²-(x-3)²
-2x²=-11