根号下则log(1/2) (2x-1)>=0=log(1/2) (1)0<1/2<1所以log(1/2) x递减所以2x-1<=1x<=1真数大于02x-1>0x>1/2所以定义域是(1/2,1]
（3x+8 ）（9x-24)=27x²-192所以a=27,b=0,c=-192顶点是(0,6)y=ax²+6形状相同则x²系数相所以y=x²/6+6
1/2
