问问?没看懂咋算出来的答案?Question #4:A cyclist bikes from town A to tow
1个回答
a
假设A离B距离为S,从A到B花了a小时,B到A花了b小时
设三个方程:15a=10b=2s 15a+10b=2s a+b=3 得出S=18
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