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X_p
(X_A+X_B)/2
y
x
以本题为例，先用x=0,y=0将三个二次函数与抛物线交点算出坐标 A(-1,0),B(4,0),C(0,2) 然后用弓形法求X_P=(0+4)/2=2 代入二次函数，计算y=-\frac{1}{2}*4+3+2=3 即P(2,3)
x=0,y=0
A(-1,0),B(4,0),C(0,2)
X_P=(0+4)/2=2
y=-\frac{1}{2}*4+3+2=3
P(2,3)
