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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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