*、乙两人骑自行车同时从相距65千米的两地出发相向而行,*的速度是每小时17.5千米,乙的速度是每小时15千米...
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*、乙两人骑自行车同时从相距65千米的两地出发相向而行,*的速度是每小时17.5千米,乙的速度是每小时15千米,求经过几小时*、乙两人相距32.5千米?
【回答】
解:设经过x小时,*、乙两人相距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:经过1小时或3小时,*、乙两人相距32.5千米.······························· 14分
知识点:实际问题与一元一次方程
题型:解答题
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