(1) 4^75 =(2^2)^75 = 2^150
而 2^150 = (2^3)^50 = 8^50
2^120 = (3^2)^60 = 9^60
所以 3^120 > 4^75 > 2^135
(2) 4^x×32^y = (2^2)^x×(2^5)^y
=2^2x×2^5y
=2^(2x+5y)
又因为 2x + 5y - 4 = 0,所以2x + 5y = 4
所以 原式＝ 2^4 = 16