2y+1/(y-1)(y+2)=a/y-1+b/y+2求ab的值

【升学】 2y+1/(y-1)(y+2)=a/y-1+b/y+2求ab的值

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[数学]解:A=-y^2+ay-1B=2y^2+3ay-2y-12A+B=-2y^2+2ay-2+2y^2+3ay-2y-1=(5a-2)y-32A+B的值与字母y的取值没有关系则5a-2=0解得a=2/5

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