(4x+1)/(x-2)(x-5)=A/(x-5)+B/(x-2)
=> 4x+1 = A(x-2) +B(x-5)
put x=2
9 = -3B
B = -3
put x=5
21=3A
A =7是不是写错了=> 4x+1 = A(x-2) +B(x-5)这步什么意思啊没错，通分母后结果o谢谢啊