化简.(a-1)²+2(a+1

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化简.(a-1)²+2(a+1化简.(a-1)²+2(a+1化简.(a-1)²+2(a+1

化简.(a-1)²+2(a+1
化简.(a-1)²+2(a+1

化简.(a-1)²+2(a+1