Odpowiedzi

2010-03-29T15:22:06+02:00
A) 3-y<5+y-2y
-y-y+2y<5-3
0<2
b) -3(z-2)-2≤z-5-4z
-3z+6-2≤ z-5-4z
-3z-z+4z≤ -5-6+2
0≤-9
c) 5(2x+3)> 2(x+3)+x
10x+15>2x+6+x
10x-2x-x>6-15
7x>-9
x>-9/7
d) 7y-2(y-4)≥6-(2-y)
7y-2y+4≥6-2+y
7y-2y-y≥6-2-4
4y≥o
y≥o
e) 4(2-x) -3(1-x)<54(1-x)
8-4x-3+3x<5-5x
-4x+3x+5x<5-8+3
4x<o
x<0
F) -⅔y-(2-3y)≤5y+2(1-y)
-⅔y-2+3y≤5y+2-2y
-⅔y+3y-5y+2y≤2+2
- ⅔y≤4
y≥-6