2019年春七年级数学下册第2章二元一次方程2.4第2课时应用二元一次方程组解决较复杂的实际问题课件新版浙教版20190119281.pptx

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第2章 二元一次方程组,第2课时 应用二元一次方程组解决较复杂的实际问题,学知识,筑方法,勤反思,知识点 利用二元一次方程组解较复杂的应用题,2.4 二元一次方程组的应用,学知识,常见的较复杂的应用题主要有两类:一是根据图表信息列二元一次方程组解决实际问题;二是利用二元一次方程组求公式中的未知系数,2.4 二元一次方程组的应用,2.4 二元一次方程组的应用,2.4 二元一次方程组的应用,类型一 根据图表信息列二元一次方程组解决实际问题,筑方法,2.4 二元一次方程组的应用,解析 设购进篮球x个,购进排球y个,根据等量关系:篮球和排球共20个;全部销售完后共获利润260元可得方程组,解方程组即可,2.4 二元一次方程组的应用,2.4 二元一次方程组的应用,类型二 用二元一次方程组求公式中的未知系数,2.4 二元一次方程组的应用,2.4 二元一次方程组的应用,2.4 二元一次方程组的应用,小结,勤反思,方程组,构造方程组,检验,2.4 二元一次方程组的应用,解方程组,反思,2.4 二元一次方程组的应用,【答案】 略,

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