指数函数运算如图已知0≤x≤2，则Y＝4的（x-0.5）次方-3×2的x次方+5的最大值为

1、a^log(a)(b)=b 2、log(a)(a)=1 3、log(a)(MN)=log(a)(M)+log(a)(N); 4、log(a)(M÷N)=log(a)(M)-log(a)(N); 5、log(a)(M^n)=nlog(a)(M) 6、log(a)[M^（1/n）]=log(a)(M)/n