一.函数,极限,连续极限的四则运算规则：lim f(x)=A,lim g(x)=B(x)lim [f(x)g(x)]=lim f(x)lim g(x)=Alim f(x)g(x)=lim f(x)lim g(x)=ABlim f(x)/g(x)=lim f(x)/lim g(x)=A/B (B)2.常用的等价公式x...