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可以用求導的方法:將a,b的值代入,對f(x)進行求導,令其值為零,解得x=2,其中x=-1.5應舍去,因為lnx中x不能為負數.將x=2代入原函數求解.題中第二項式子最好加上括弧區分一下分子分母,本解法只是認為(1/2)*(x*2).
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