1.設A(2,0)、B(3,5)、C(-1,-1)、D(4,y),若
【用戶】Jiunndar Yeh
【年級】幼兒園下
【評論內容】因兩線段平行,即其斜率相等mAB = (5 - 0)/(-3 - 2) = 5/(-5) = -1故mCD = [y - (-1)]/[4 - (-1)] = (y + 1)/5 = -1 = mAB y + 1 = -5 y = -5 - 1 = -6 ...選項(D)正確