2个回答
展开全部
-1<=lg(x/y)<=1
-1<=lg(x^2y)<=1
所以
1/10<=x/y<=10
1/10<=x^2*y<=10
(xy)^(3/2)=(x/y)^(-1/2)(x^2*y)
所以把x/y,x^2*y的上下限分别代入
(1/10)^(-1/2)*(1/10)<=(xy)^(3/2)<=10^(-1/2)*10
化简得
(1/10)^(1/2)<=(xy)^(3/2)<=10^(1/2)
不等式同取(2/3)次方
(1/10)^(1/3)<=xy<=10^(1/3)
有点麻烦 毕竟不如手写的方便 根号表示不了
求采纳
-1<=lg(x^2y)<=1
所以
1/10<=x/y<=10
1/10<=x^2*y<=10
(xy)^(3/2)=(x/y)^(-1/2)(x^2*y)
所以把x/y,x^2*y的上下限分别代入
(1/10)^(-1/2)*(1/10)<=(xy)^(3/2)<=10^(-1/2)*10
化简得
(1/10)^(1/2)<=(xy)^(3/2)<=10^(1/2)
不等式同取(2/3)次方
(1/10)^(1/3)<=xy<=10^(1/3)
有点麻烦 毕竟不如手写的方便 根号表示不了
求采纳
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