2x-4/(x^2-4x-5)=A/(x-5)+B/(x+1),x≠5,-1.A.B的值是
1个回答
等式两边同时乘以(X-5)(x+1)
德
2x-4=B(x-5)+A(x+1)=BX-5b+Ax+A
所以a+b=2
a-5b=-4
解得
b=1,a=1
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