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2x+3y=5xy 3x﹣x=3 2x+3x=5x2 ﹣x2﹣x2=﹣2x2
x2+2 x2+3x+2 x2+3x+3 x2+2x+2
3x-2x=1 3x+2x=5x2 3x·2x=6x 3x-2x=x
[-2,-1] [-1,1] [1,2] [2,3]
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
2x2-4x2=-2 3x+x=3x2 3x·x=3x2 4x6÷2x2=2x3
2x2+x﹣3 2x2﹣x﹣3 2x2﹣x+3 x2﹣2x﹣3
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
(x+3)(x-2) (-1-3x)(1+3x) (a2+b)(a2-b) (3x+2)(2x-3)