1≤lg(x/y)≤2则10≤x/y≤10010y≤x≤100y(100y)^(-5/9)≤x^(-5/9)≤(10y)^(-5/9).(1)2≤lg（x^2/根号y）≤3则100根号y≤x^2≤1000根号y(100根号y)^(16/9)≤(x^2)^(16/9)≤(1000根号y)^(16/9).(2)(1)(2)两式相乘10^(...