Odpowiedzi

2010-03-03T21:25:05+01:00
A) -2 + 2 + 5x > 7x + 12
-2x+5x-7x>12-2
-4x>10/:(-4)
x< - 10/4
x<2,5
d)⅚x - 6+x/3 _< 1½ / * 6
5x-6(6+x)/3 _< 9
5x - 2(6+x) _<9
5x-12+2x_<9
5x + 2x _< 9+12
7x_<21/:3
x_<7
f)⅓(x-½) - 5x-1/2 _< x- ⅔(x+1)/*6
2(x-1/2)-3(5x-1) _< 6x-4(x+1)
2x-1 - 15x +3_< 6x - 4x -1
2x-15x-6x+4x_<-1+1-3
-15x_<-3/:(-15)
x>_1/5
e)2(x+2)/3 - 2-3x/9 >_ x-1/*9
6(x+2)-(2-3x) >_9x -9
6x+12-2+3x>_9x-9
6x+3x-9x>_-9-12+2
9x-9x>_-19
0>_-19