黄蚂蚁和黑蚂蚁为了一点小事吵个没完没了,它们两个都说自己跑得快。黄蚂蚁腿长,一步顶黑蚂蚁两步;黑蚂蚁腿短,但步子迈得快,黄蚂蚁迈一步,它可迈两步。为了让对方能心服口服,它们两个决定现场比赛。两人来到一块开阔地,正好看到蝼蛄大哥在地上画了三个半圆(图1),准备玩游戏。于是,黄蚂蚁指着半圆说:“沿着这个大半圆可以从甲地跑到乙 Yellow ants and black ants quarrel for a little thing endless, both of them say that they run faster. Yellow ants long legs, step black ants top two steps; black ants legs short, but the step is too fast, yellow ants step, it can step two steps. In order to make each other convinced, both of them decided to live game. They came to an open area, just to see the big brother on the ground painted three semicircles (Figure 1), ready to play the game. As a result, yellow ants pointed semicircle said: ”Along the big semicircle can run from A to B