初二几何今天的第三道///全是高分!如图:正方形ABCD的边长为6CM,M为BC上一点(M不与B,C重合),N为CD上一点,∠MAN=45度(1)求证:BM+DN=MN(2)设NM=x,DN=y,写出y与x的函数关系式,并指出自变量的取
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![初二几何今天的第三道///全是高分!如图:正方形ABCD的边长为6CM,M为BC上一点(M不与B,C重合),N为CD上一点,∠MAN=45度(1)求证:BM+DN=MN(2)设NM=x,DN=y,写出y与x的函数关系式,并指出自变量的取](/uploads/image/z/15077841-33-1.jpg?t=%E5%88%9D%E4%BA%8C%E5%87%A0%E4%BD%95%E4%BB%8A%E5%A4%A9%E7%9A%84%E7%AC%AC%E4%B8%89%E9%81%93%2F%2F%2F%E5%85%A8%E6%98%AF%E9%AB%98%E5%88%86%21%E5%A6%82%E5%9B%BE%EF%BC%9A%E6%AD%A3%E6%96%B9%E5%BD%A2ABCD%E7%9A%84%E8%BE%B9%E9%95%BF%E4%B8%BA6CM%2CM%E4%B8%BABC%E4%B8%8A%E4%B8%80%E7%82%B9%EF%BC%88M%E4%B8%8D%E4%B8%8EB%2CC%E9%87%8D%E5%90%88%EF%BC%89%2CN%E4%B8%BACD%E4%B8%8A%E4%B8%80%E7%82%B9%2C%E2%88%A0MAN%3D45%E5%BA%A6%EF%BC%881%EF%BC%89%E6%B1%82%E8%AF%81%EF%BC%9ABM%2BDN%3DMN%EF%BC%882%EF%BC%89%E8%AE%BENM%3Dx%2CDN%3Dy%2C%E5%86%99%E5%87%BAy%E4%B8%8Ex%E7%9A%84%E5%87%BD%E6%95%B0%E5%85%B3%E7%B3%BB%E5%BC%8F%2C%E5%B9%B6%E6%8C%87%E5%87%BA%E8%87%AA%E5%8F%98%E9%87%8F%E7%9A%84%E5%8F%96)
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