答
--≤a≤2
2
(2,2)
(4α)
(1)
1BC =
1-3=-1-3
L82=3x+y=8
x=2→6+y=8
(2,-5)
~C ((3,-1)
MAR=
1-(-1)
2
=
ax+by+6≥0
⑦已知聯立不等式 2x+y+c≤0 之解的範圍如圖,
-1-3
=
L₁z= x+2y=1
dx+ey+f≥0
請判斷下列選項何者正確?
(1)b<0
(2)c<0
(3)de<0
(4)f<0
x=2,2+2-
2x+y=-C, (<O
2x+y+c=0
ax+by=-b
(5)a、b、c、d、e、f中恰有三個正數。【北模】
:(2)(3)(5)
x+3y25M=-2
5X+3y=b=25
8. 如圖所示,已知不等式,ax+y≤3 的可行解區域為
B(2,5)
5x + 3y ≤ b m = - {{\
△ABC(含邊界),請選出正確的選項:
3
(5)
