Odpowiedzi

2009-11-10T16:48:00+01:00
B)3(x+1)/2 -3≤2(x-1)-x /×2
3(x+1)-6≤4(x-1) - 2x
3x+3-6≤4x-4-2x
x≤ -1


c)(x+3)²+2≥(x+5)(x-5)
x²+6x+9+2≥x²-25
6x≥36
x≥6