問題詳情:
*、乙兩人騎自行車同時從相距65千米的兩地出發相向而行,*的速度是每小時17.5千米,乙的速度是每小時15千米,求經過幾小時*、乙兩人相距32.5千米?
【回答】
解:設經過x小時,*、乙兩人相距32.5千米·············································· 7分
17.5x+15x = 65-32.5或 17.5x+15x = 65+32.5······································· 11分
解方程(1)得x=1,解方程(2)得x=3 ································································· 13分
答:經過1小時或3小時,*、乙兩人相距32.5千米.······························· 14分
知識點:實際問題與一元一次方程
題型:解答題