(1 ) 已知8x+9/(x^2+x-6)=A/(x+3)-B/(x-2),求AB的值(2)     已知m-n/x=n+m/x(m不等于n)求x的值

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(1 ) 已知8x+9/(x^2+x-6)=A/(x+3)-B/(x-2),求AB的值(2)     已知m-n/x=n+m/x(m不等于n)求x的值
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(1 ) 已知8x+9/(x^2+x-6)=A/(x+3)-B/(x-2),求AB的值(2)     已知m-n/x=n+m/x(m不等于n)求x的值
(1 ) 已知8x+9/(x^2+x-6)=A/(x+3)-B/(x-2),求AB的值
(2)     已知m-n/x=n+m/x(m不等于n)求x的值

(1 ) 已知8x+9/(x^2+x-6)=A/(x+3)-B/(x-2),求AB的值(2)     已知m-n/x=n+m/x(m不等于n)求x的值
(1)先对后面通分
(8x+9)/(x2+x-6)=【(A-B)x-(2A+3B)】/(x2+x-6)
利用待定系数法
A-B=8 2A+3B=-9
A=3 B=-5
(2) x做分母 x不为零
mx-n=nx+m (m-n)x=m+n m不等于n
x=(m+n)/(m-n)
见到题自己多思考一下!

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