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4.設a、b為任意正實數，則下列何者正確?(A)若r、s為有
Jan 12th 2014, 02:36

1.設1/3^x=27^y，則下列何者正確?(A)3x=y(B)x=3y(C)3x=-y(D)x=-3y。
2.若2^4x+x^2=1/16,則x=(A)-2(B)-1(C)0(D)2。
3.若x、y為整數，且6^xX8^y=2^9X3^3，則x+y=(A)4(B)5(C)6(D)7。
4.設a、b為任意正實數，則下列何者正確?(A)若r、s為有理數，則a^r/s=小r根號a^s(B)若r、s為有理數，則a^rXa^s=a^rXs(C)小5根號a^5=a(D)a+b。
5.若a>0且a不等於1，關於f(x)=a^x圖形的敘述，下列何者正確?(A)圖形恆在y軸右方(B)恆過定點(0，1)(C)圖形恆在x軸下方(D)必為遞增函數。

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