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1.先分组,再通分例1计算1/(a-2)-2/(a+1)+2(a-1)-1/(a+2)·分析a+2与a-2相乘,a+1与a-1相乘可用平方差公式,故本题采用分组通分的方法来解为好.
1. Group first, and then calculate 1/(a-2)-2/(a+1)+2(a-1)-1/(a+2) by dividing 1 to analyze a+2 and a-2 Multiply, a+1 and a-1 can be used to multiply the square difference formula, so this question is solved by grouping and dividing.