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高中数学必修 第一册（648题）
若
A.\({\mathrm{log}}-{a}x\cdot {\mathrm{log}}-{a}y={\mathrm{log}}-{a}\left ( {xy} \right )\)
B.\( \frac{{\mathrm{log}}-{a}x}{{\mathrm{log}}-{a}y}={\mathrm{log}}-{a}\frac{x}{y}\)
C.\( {\mathrm{log}}-{a}{x}^{2}=2{\mathrm{log}}-{a}x\)
D.\( {\mathrm{log}}-{a}x-{\mathrm{log}}-{a}y={\mathrm{log}}-{a}\frac{x}{y}\)
知识点：第四章 指数函数与对数函数
参考答案：ABC