數學問題以下哪裡錯? 1.在xy面上,型如x2+y2+dx+:－new htc one開箱,htc手機評價,htc手機比較,htc手機遊戲,htc手機維修,htc手機價位,htc手機推薦,htc手機鈴聲,中華電信htc手機,htc手機截圖,亞太htc手機,

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數學問題以下哪裡錯? 1.在xy面上,型如x2+y2+dx+

Oct 27th 2013, 13:50

1.必須(d2+e2-4f)大於零;才是平面上的圓

2.若L1與L2交於一點,則L1與L2等距離之所有點之圖形為二直線即角平分線;

若L1與L2平行,則L1與L2等距離之所有點之圖形為一直線

另外一題
三直線,其斜率分別為m1,m2,m
其中角平分線之斜率為m
逆時針旋轉時設m1大於,m大於,m2
則m1-m/1+mm1=(m-m2/1+mm2);

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