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已知1/a＋1/b=1/3,1/b＋1/c=1/6,1/c＋1/a=1/9，求abc/ab＋bc＋ac值 。这是一道分式求值问题，如果我们从已知中分别求出口、6、c，再代人所求分式，显然是二件非常困难的事，考虑到将所求分式取倒数化简，
对一类分式求值题的变式剖析
【摘 要】
：
已知1/a＋1/b=1/3,1/b＋1/c=1/6,1/c＋1/a=1/9，求abc/ab＋bc＋ac值 。这是一道分式求值问题，如果我们从已知中分别求出口、6、c，再代人所求分式，显然是二件非常困难的事，考虑到将所求分式取
【机 构】
：
贵州省绥阳县宽阔镇宽阔中学
【出 处】
：
数理化解题研究(初中版)
【发表日期】
：
2013年2期
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