求过程，高中数学，仅一个问题
\u9ad8\u4e2d\u6570\u5b66\u4ec5\u4e00\u9898\uff0c\u6c42\u8fc7\u7a0b而BX/(1-3x)^2是分子比分母低一级的无穷大，故其极限为0，
CX/(1-3x)的分子与分母为同级无穷大，其极限为分子与分母的最高次项系数之比，故为C/(-3)=-1/3C
从而可得极限为A-1/3C
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