重庆市2023-2024学年高二年级(下)2月月度质量检测数学.考卷答案

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重庆市2023-2024学年高二年级(下)2月月度质量检测数学.考卷答案试卷答案

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分析由1≤lg(xy)≤4,-1$≤lg\frac{x}{y}$≤2,可得:1≤lgx+lgy≤4,-1≤lgx-lgy≤2,而lg$\frac{{x}^{2}}{y}$=2lgx-lgy,设2lgx-lgy=m(lgx+lgy)+n(lgx-lgy),利用“待定系数法”即可得出.

解答解:由1≤lg(xy)≤4,-1$≤lg\frac{x}{y}$≤2,可得:1≤lgx+lgy≤4,-1≤lgx-lgy≤2,
而lg$\frac{{x}^{2}}{y}$=2lgx-lgy
设2lgx-lgy=m(lgx+lgy)+n(lgx-lgy),
∴$\left\{\begin{array}{l}{m+n=2}\\{m-n=-1}\end{array}\right.$,
解得m=$\frac{1}{2}$,n=$\frac{3}{2}$.
∴lg$\frac{{x}^{2}}{y}$=2lgx-lgy=$\frac{1}{2}$(lgx+lgy)+$\frac{3}{2}$(lgx-lgy),
∴-1≤$lg\frac{{x}^{2}}{y}$≤5,
故答案为:[-1,5].

点评本题考查了不等式的性质、对数的运算法则,考查了推理能力与计算能力,属于中档题.