问题∫[1/(x-2)(x+2)]dx=1/4∫[1/(x-2)-1/(x+2)]dx 是怎么得来的?原理?
1个回答
噢,假设1/(x-2)(x+2)=A/(x-2)+B/(x+2)
通分,比较系数可得A=1/4,B=-1/4
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