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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 
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請教 螞蟻雄兵 知識長
Mar 9th 2014, 13:09

這是知識長之前幫網友解方程組的解法

覺得很好用（老師沒這樣敎）

3x=2y+1
6x+5y=－16
x和y的解是幾?
Sol
2*(3x)－(6x+5y)=2*(2y+1)－(－16)

請問

如果是比較繁瑣的方程組，是否也有辦法這樣解題？

要如何把握重點？

題目是從考卷找的

3X －4 Y －1 ＝3（2X－ Y＋2）

2（4X ＋2 Y＋3）＝ 7 X ＋Y ＋9

感謝您

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