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Re:终于知道了In Reply To:Re:终于知道了 Posted by:gdufs at 2006-10-21 09:17:00 > (x-0)^2 = (y-0)^2= r^2 > r由x,y坐标确定。面积是半圆。看坐标不能看园和轴的交点哦哦！！！ Followed by:
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