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逆向利用分式的加减运算法则a/b±c/d=(da±bc)/bd,能把一个分式分拆成另外两个分式(或一个分式与一个整式)的和(或差),进而解决与分式有关的问题.
The use of fractional addition and subtraction, a/b±c/d=(da±bc)/bd, can split a fraction into the sum of two other fractions (or one fraction and one integer). Or worse, and then solve the problems related to the fraction.