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y=x3+6x2+9x y=x3-6x2+9x y=x3-6x2-9x y=x3+6x2-9x
x= x=3 x1=,x2=3 x1=﹣,x2=﹣3
x2-6x+32=-7 x2-6x+32=2 x2-6x+9=13 x2-6x+6=-1
6x2+3x=9x3 6x2÷3x=2x (﹣6x2)3=36x6 6x2•3x=18x2
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[-2,-1] [-1,1] [1,2] [2,3]
x2+9 x2-6x+9 x2+6x+9 x2+3x+9
x2﹣9+6x=(x+3)(x﹣3)+6x (x+5)(x﹣2)=x2+3x﹣10 x2﹣8x+16=(x﹣4)2 6ab=2a•3b
a(x)与β(x)是等价无穷小 a(x)与β(x)是高价无穷小 a(x)是β(x)的低阶无穷小 a(x)与β(x)是同阶无穷小但不是等价无穷小
6x2+3x=9x3 6x2·3x=18x2 (-6x2)3=36x6 6x2÷3x=2x
x2-6x+9=(x-3)2 (x+3)(x-1)=x2+2x-3 x2-9+6x=(x+3)(x-3)+6x 6ab=2a·3b
α(x)与β(z)是等价无穷小 α(x)与β(x)是高价无穷小 α(x)是β(z)的低价无穷小 α(x)与β(x)是同价无穷小但不是等价无穷小