部分分式求证例1:5x+1 A B_____________ = _____ + _____ ; (x-1)(X+2) x-1 x+2例2:x+1 A B___________ = ____ + ________(x-1)^2 x-1 (x-1)^2例3:x^2-3x-13 Ax+B C______________ = _________ - ______(x^2+4)(x-1) x^2+4 x-1请问右边的式子
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