(1)原式=(5/4)^33×(4^62)×(1/4)^30÷(5^32)=5^(33-32)×4^(-33+62-30)=5×4^(-1)=5/4(2)已知x、y为正整数,且x+2y=3所以,x=y=1原式=4×8/16^2=1/8(3)2^a=3,4^b=5,8^c=7由4^b=5 ==> (2^2)^b=5 ==> 2^(2b)=5所以,原式...