摘要：54．已知.用“+ 或“ 连接.有三种不同的形式:.请你任选其中一种进行计算.并化简求值.其中∶=5∶2． [关键词]分式运算 [答案]选择一:. 当∶=5∶2时..原式=． 选择二:. 当∶=5∶2时..原式=． 选择三:. 当∶=5∶2时..原式=． 注:只写一种即可． 55化简:,(2)解不等式组: [关键词]约分与通分.分式运算.解一元一次不等式(组) [答案](1)解:原式 ．······························································································· 4分 (2) 解:解不等式①得 . 解不等式②得 ． 所以原不等式组的解集为．···································································· 4分

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