Rút gọn \(F = \left( {x - y} \right)\sqrt {\frac{{xy}}{{{{\left( {x - y} \right)}^2}}}} \,\,\left( {x...

Câu hỏi :

Rút gọn \(F = \left( {x - y} \right)\sqrt {\frac{{xy}}{{{{\left( {x - y} \right)}^2}}}} \,\,\left( {x < y < 0} \right)\)