xiaofang3a的专栏

Problem Description Ignatius bought a land last week, but he didn't know the area of the land because the land is enclosed by a parabola and a straight line. The picture below shows the area. Now giv

Problem Description Dennis and Joyce love to collect stones and play games with them. Up till now they have collected Na white stones and Nb black stones, and they are going to play a new game. The r