多項式(19)
Author: 藍邦偉　老師

f(a)>0⇒-2<a<-1或1<a<2

(1)-8=(-2)³>(-\sqrt[3]{9})=-9

(2)0>\left( -\sqrt[3]{\frac{1}{9}}  \right) ^3=-\frac{1}{9}>-1=(-1)³

(3)1=1³<(\sqrt[3]{7})³<2³=8

$ (4)\left( \sqrt[3]{\frac{1}{7}}  \right) ³=\frac{1}{7} <1=1³$

(5)0<\left(  \sqrt[3]{\frac{1}{7}} \right) ³=\frac{1}{7}

A = Point(xAxis)
B = Point(xAxis)
C = Point(xAxis)
D = Point(xAxis)
E = Point(yAxis)
f = Polynomial({A, B, C, D, E})
v = Vector((0, -2.5), (0, 2))
n = 0 (slider from 0 to 7, step 1)
F = (-2.533272402398651, 1.2239948679877337)
poly1, a, b, f_1, c = Polygon(Corner[1], (x(F), y(Corner[1])), F, (x(Corner[1]), y(F)))
G = (-5.714618740735038, 1.6183766454674509)
G_1: G + (0.5, 0)
G_3: G + (0, 0.4)
G_2: G_1 + G_3 - G
poly2, g, g_1, g_2, g_3 = Polygon(G, G_1, G_2, G_3)
u = Vector((-2.5, 0), (2.6, 0))