3.解析】(1)当a2时,f(x)=2x-1-x=31,:x-1-12x-(2x-1)-(2x=3)=2l-2x-31≤2,由题意知2m2-m-122…m≥或m≤-1m的取值范围为(一∞,-15分(2)f(x)23x-3即2x-1-x-323x-3在x∈[12]上有解,即ax-≤2-x在x∈[1,2]上有解,2sax-3s2-x,则+≤as-1在x∈[2]上有解,(1+-)msas(-1)mx≤a≤4,故a的取值范围为=,410分

Our school had a school choir competition June 20. As Panning, the competition tookonplannedplace in the main hall. I was very nervousafter we began to perform. Hid!"IStartto have thebeforestartedhiccups(t] WM). Lisa advised me to hold my breath and countedto ten, while Amy brought somecountwarm water and asked me to drinkthemwaItMy friends tried to help me in manybut nothingwaysworked."BOO! " Tony frightened me from behind my back. I was Suchsurprised that my hiccupsstopped, At last, we sang inbeautifully harmony on the stage.beautiful

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