1. 10^a表示10的a次方. 10^(2a+3b) =10^(2a)*10^(3b) =(10^a)^2*（10^b)^3 =5^2*6^3 =(5*6)^2*6 =30^2*6 =5400 2. 2x+5y-3=0 2x+5y=3 4^x*32^y =2^(2x)*2^(5y) =2^(2x+5y) =2^3 =8 3. 3^555=(3^5)^111=243^111 4^444=(4^4)^111=256^111 5^333=(5^3)^111=125^111 因此4^444>3^555>5^333