分式如何拆分,有公式吗
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1/(t^2-1)
=1/[(t+1)(t-1)]
let
1/[(t+1)(t-1)] ≡ A/(t+1) + B/(t-1)
=>
1≡A(t-1) + B(t+1)
t=-1 => A=-1/2
t=1 => B=1/2
1/[(t+1)(t-1)] ≡ (1/2) [-1/(t+1) + 1/(t-1)]
这是部分分式分解( partial fraction decomposition )
=1/[(t+1)(t-1)]
let
1/[(t+1)(t-1)] ≡ A/(t+1) + B/(t-1)
=>
1≡A(t-1) + B(t+1)
t=-1 => A=-1/2
t=1 => B=1/2
1/[(t+1)(t-1)] ≡ (1/2) [-1/(t+1) + 1/(t-1)]
这是部分分式分解( partial fraction decomposition )
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