急!!請問如何判斷象限問題?請詳述!!:－線上遊戲排行榜2013/2014,進擊的巨人線上看,candy crush saga外掛,正妹寫真三圍

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Madesmith

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Sep 14th 2013, 11:57

1.(-3,1-根號2)
在第三象限對嗎?
因為我認為在第二項限
答案怪怪的
對的第三象限版主知道象限的位置吧右上左上左下右下分別是1234象限
-3為負數這是確認的 1-根號2 版主想想根號2是1~2之間也就是比1大比2小所以1 - 比1大的數結果會小於0 所以這個點是(負,負)在第三象限
2.設點(2a-5+3)在第二項限,則a的範圍是?
答案是....-3<a<5/2
怎麼算出來的?
版主這題題目敘述有問題沒有點坐標有可能是(2a-5 , 3) 或是(2a,-5+3 )
有可能是原題目沒有打清楚我會再補充說明把這兩個情況分別解答
3.設(x-2)平方+(y+3)平方=0,x,y為實數,則點(X,y)在第幾象限?
答案...第四
平方+平方=0,平方永遠是正數或0 所以這個式子唯一可能性就是0+0=0
也就是說x-2=0 x=2 , y+3=0 y=-3 ---->(2,-3)為(正,負) 在第四象限

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