sat数学题一道求高手
Inthexy-plane,threeoftheverticesofasquareare(0,0),(0,3),and(3,0).Ifthesquareisreflect...
In the xy-plane, three of the vertices of a square are (0,0), (0,3), and (3,0). If the square is reflected about the line y= -x, which of the following is one vertex of the resulting square?
答案是
A. (-3, -3)
怎么做啊??为什么是A 展开
答案是
A. (-3, -3)
怎么做啊??为什么是A 展开
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