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等價無窮小首先來看看什麼是無窮小:無窮小就是以數零為極限的變數.確切地說,當引數x無限接近x0(或x的絕對值無限增大)時,函數值f(x)與零無限接近,即f(x)=0(或f(x)=0),則稱f(x)為當x→x0(或x→∞)時的無窮小量….
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