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題目好象錯了,應該是y=根號下x,才對ds=ydx=x^1/2dx,s=Sx^1/2dx,積分區間為[1,2]令根號x=t,x=t^2,s=S2T^2dt=2/3Sdt^3,積分區間為[1,根號2] s=2/3[(根號2)^3-1^3]=(4根號2-1)/3
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