濟南與*兩地相距480千米,乘坐高鐵列車比乘坐普通快車能提前4小時到達.已知高鐵列車的平均行駛速度是普...
問題詳情:
濟南與*兩地相距480千米,乘坐高鐵列車比乘坐普通快車能提前4小時到達.已知高鐵列車的平均行駛速度是普通快車的3倍,求高鐵列車的平均行駛速度.
【回答】
解:設普通快車的速度為xkm/h,由題意得:·················································· 1分
·································································································· 3分
=4············································································································ 4分
x=80················································································································ 5分
經檢驗x=80是原分式方程的解········································································ 6分
3x=3×80=240 ·································································································· 7分
答:高鐵列車的平均行駛速度是240km/h.····················································· 8分
知識點:分式方程
題型:解答題