多項式(15)
Author: 藍邦偉　老師

45°

x

y

$⇒ \left\lbrace\begin{array}{ll} y=x  \ y=2x-\frac{x²}{3}  \ \end{array}   \right.\ $

∵ \overleftrightarrow{OA}:y=tan45° x⇒y=x 

⇒x=2x-\frac{x²}{3}

$ ⇒x²-3x=x(x-3)=0 $

⇒x=3,0(不合)

A = (3, 3)
O = (0, 0)
a = Segment(O, (5, 5))
U_1 = (-1, 0)
U_2 = (6, 0)
U_3 = (0, -1)
U_4 = (0, 6)
u = Vector(U_1, U_2)
v = Vector(U_3, U_4)
f(x) = 2 * x - x^(2) / 3
g = Function(f, 0, 3)
n = 0 (slider from 0 to 6, step 1)
B = (-9.56086470243902, 6.241371063414625)
B_1: B + (0.5, 0)
B_3: B + (0, 0.5)
B_2: B_1 + B_3 - B
poly1, b, b_1, b_2, b_3 = Polygon(B, B_1, B_2, B_3)