Odpowiedzi

2010-03-30T20:55:43+02:00
A) 3-y<5+y-2y
3-y < 5-y
-y-y < 5+3
-2y < 8 |:(-2)
y > 4

b) 5(2x+3)>2(x-3)+x
10x+15 > 2x-6+x
10x+15 > 3x-6
10x-3x > -6-15
7x > -21 |:7
x > -3

c) -3(z-2)-2≤ z-5-4z
-3z+6-2 ≤ z-4z -5
-3z+4 ≤ -3z -5
-3z+3z ≤ -5-4
0≠-9
2010-03-30T20:58:28+02:00
A) 3-y<5+y-2y
-y-y+2y<5-3
0<2
b) 5(2x+3)>2(x-3)+x
10x+15>2x-6+x
10x-3x>-6-15
7x>-21
x>-3
c) -3(z-2)-2≤ z-5-4z
-3z+6-2≤-5-3z
-3z+3z≤-5-6
0≤-11