错了吧应该是xxy3yx5yxxy3xy15yx2xy15y0x5yx3y0x0y0所以x3y0即不等于0所以只有x5y0x5y所以x25yxy5y结果一 题目 解数学根号题x>0,y>0, 且根号x(根号x + 根号y )=3倍根号x(根号x +5倍根号y )时,求 2x+根号xy+3y --- x+根号xy-y 答案 √x(√x+√y)=3√x(√x+5√y)?错了吧...
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