摘要：19．(1)解:原式=···································································· =······································································· =．······························································································· (2)解:原式=············································································ =·························································································· =1．·········································································································· (3)解:移项.得配方.得····················································· ∴∴······································································ (注:此题还可用公式法.分解因式法求解.请参照给分)

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