題目如下 (3x-5y-51)^2+12x+7y-31=0,求x+y=?國中 回應 liuyiwu Re: help 2005-08-30 20:12 抱歉...答案想錯了...在此將之刪除.. jj82620 Re: help 2005-09-04 14:22 3x=5y+51 12x+7y=29 20y+204+7y=29 27y=-175 y=-6+13/27 x=27/153 x+y=36+140/459 是這樣嗎?
jj82620 Re: help 2005-09-04 14:22 3x=5y+51 12x+7y=29 20y+204+7y=29 27y=-175 y=-6+13/27 x=27/153 x+y=36+140/459 是這樣嗎?
回應
liuyiwu
Re: help
2005-08-30 20:12jj82620
Re: help
2005-09-04 14:2212x+7y=29
20y+204+7y=29
27y=-175
y=-6+13/27
x=27/153
x+y=36+140/459
是這樣嗎?