Odpowiedzi

2010-04-12T22:10:15+02:00
A) 2(x+3) - 5 > -2x-7
2x+6-5>-2x-7
2x+2x>-7-6+5
4x>-8 / 4
x= -2

b) -2(x-1)+5x>7x+12
-2x+2+5x>7x+12
-2x +5x-7x>12-2
-4x>10 / -4
x< - 10/4
x< - 2 1/2

c) 1/3x +1 >-x +2
1/3 x +x>2-1
4/3x>1 / 4/3
x> 3/4

d) 2(3-x) - 3(x-1) -1
6-4x-3x+3-1
8-7x

e) 2.4(x-1) - 4.5<3(0.5-0.6)
2.4x - 2.4 - 4.5 < 1.5-1.8x
2.4x + 1.8x<1.5+2.4+4.5
4.2x<8.4 /4.2
x<2