2019年春七年级数学下册第9章分式9.3分式方程第2课时分式方程的应用教学课件(新版)沪科版.pptx

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第9章 分 式,9.3 分式方程,4.马小虎的家距离学校1800米,一天马小虎从家去上学,出发10分钟后,爸爸发现他的数学课本忘记拿了,立即带上课本去追他,在距离学校200米的地方追上了他,已知爸爸的速度是马小虎速度的2倍,求马小虎的速度.,12.某校进行期末体育达标测试,甲、乙两班的学生数相同.甲班有48人达标,乙班有45人达标,甲班的达标率比乙班高6%,求乙班的达标率.,13.某市某学校开展以“远足君山,磨砺意志,保护江豚,爱鸟护鸟”为主题的远足活动.已知学校与君山岛相距24千米,远足服务人员骑自行车,学生步行,服务人员骑自行车的平均速度是学生步行平均速度的2.5倍.服务人员与学生同时从学校出发,到达君山岛时,服务人员所花时间比学生少3.6小时.求学生步行的平均速度是多少千米/小时?,

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