模考碰到一道MATH，很明显啊，可是答案却是另外一个...

sofia1986

For any triangle T in the xy-plane, the center of T is defined to be the point whose x-coordinate is the average of the x-coordinate of the vertices of T and whose y-coordinate is the average of the y-coordinates of the vertices of T.If a certain triangle has vertices at the points (0,0) and (6,0) and center at the point (3,2), what are the coordinates of the remaining vertex?

为什么答案不是（3，4）
而是（3，6）呀....

Iljiajia

呵呵，楼主还是没读清题吧？？三个顶点坐标数的平均值是（3，2），给了其中两个坐标分别是（0，0）和（6，0）

最后一个顶点的横坐标=（3x3）-6-0=3
纵坐标=2x3-0-0=6  怎么会是4呢？