<a href="http://www.docin.com/p-1881480712.html">http://www.docin.com/p-1881480712.html</a>"/>
<a href="http://www.docin.com/p-1881480712.html">http://www.docin.com/p-1881480712.html</a>"/>

七年数学课件:习题7.2 “用坐标表示平移”评讲