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Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決
Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決
請問一個數學題目
Jun 8th 2013, 14:35

因為題目沒限制 所以答案有兩個

首先 先把題目裡有關1+y 的 改換成x 這樣才符合題目給的1+y=x

然後再將方程式同乘x^(2)

>>>1500x^(2)=600x+1440

再將等號右邊的方程式移到左邊且加負號

>>>1500x^(2)-600x-1440=0

再除以1500使次冪最高項的係數為1 (方便計算未知數)

>>>x^(2)-0.4x-0.96=0

再用數學最基本求未知數的公式求解 或用計算機求

得x=1.2 、-0.8

將x帶入題目所給的1+y=x 後

得y=0.2 、-1.8

所以答案為 x=1.2 ， y=0.2

或x=-0.8 ， y=-1.8

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