數線上有A,B,C,D,四點且B點在C點的右邊14 單位長的位置且D點為B,C兩點的中點若B點坐標為-16且AC距離=12則（１）D點坐標為多少(2）A點坐標為多少 很急拜托謝謝?
回答 (2)
2020-10-03 10:47 pm
首先說聲: "對不起! 前時弄錯了."
B = -16
B = C + 14
∵ C = B - 14 = -16 - 14 = -30
D = (B+C)/2 = [(-16)+(-30)]/2 = -23
|A-C| = 12
∴ A-C = 12 或 -12
∴ A = C + 12 = -30 + 12 = -18
或 A = C - 12 = -30 - 12 = -42
B = -16
B = C + 14
∵ C = B - 14 = -16 - 14 = -30
D = (B+C)/2 = [(-16)+(-30)]/2 = -23
|A-C| = 12
∴ A-C = 12 或 -12
∴ A = C + 12 = -30 + 12 = -18
或 A = C - 12 = -30 - 12 = -42
收錄日期: 2021-05-04 02:33:19
原文連結 [永久失效]:
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