________all the work finished ahead of time,I feel relaxed and very happy to be reading the papers.
已知x2+kxy+64y2是一个完全平方式,则k的值是( )
一个三角形三边长分别为5cm,8cm,12cm,另一个与它相似的三角形的最长边为4.8cm,求另外两边长.