大学数学题求教!是英语原题,试着翻译过来：1:给出线段a,b,c,构建ax+b=c的根.记得方程式的根等于方程式的解；几何上来说,这是个平面和x轴的相交部分.Construct the root of ax+b=c,given line segments a,b,c.Recall the root of an equation is the solution to the equation; geometrically,it is the intersection of the graph and the x-axis.2:证明两个投射面的连通和是克莱恩瓶.Show that the connected sum of two projective planes is the Klein bottle.

大学数学题求教!
是英语原题,试着翻译过来：
1:
给出线段a,b,c,构建ax+b=c的根.记得方程式的根等于方程式的解；几何上来说,这是个平面和x轴的相交部分.
Construct the root of ax+b=c,given line segments a,b,c.Recall the root of an equation is the solution to the equation; geometrically,it is the intersection of the graph and the x-axis.
2:
证明两个投射面的连通和是克莱恩瓶.
Show that the connected sum of two projective planes is the Klein bottle.