小影看一本书,看过的页数与没看过的页数的比是3:7,再看12页,正好看了全书的2分之1,这本书有多少页?((只列式不计算)用算术写
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![小影看一本书,看过的页数与没看过的页数的比是3:7,再看12页,正好看了全书的2分之1,这本书有多少页?((只列式不计算)用算术写](/uploads/image/z/8348934-30-4.jpg?t=%E5%B0%8F%E5%BD%B1%E7%9C%8B%E4%B8%80%E6%9C%AC%E4%B9%A6%2C%E7%9C%8B%E8%BF%87%E7%9A%84%E9%A1%B5%E6%95%B0%E4%B8%8E%E6%B2%A1%E7%9C%8B%E8%BF%87%E7%9A%84%E9%A1%B5%E6%95%B0%E7%9A%84%E6%AF%94%E6%98%AF3%EF%BC%9A7%2C%E5%86%8D%E7%9C%8B12%E9%A1%B5%2C%E6%AD%A3%E5%A5%BD%E7%9C%8B%E4%BA%86%E5%85%A8%E4%B9%A6%E7%9A%842%E5%88%86%E4%B9%8B1%2C%E8%BF%99%E6%9C%AC%E4%B9%A6%E6%9C%89%E5%A4%9A%E5%B0%91%E9%A1%B5%3F%28%EF%BC%88%E5%8F%AA%E5%88%97%E5%BC%8F%E4%B8%8D%E8%AE%A1%E7%AE%97%EF%BC%89%E7%94%A8%E7%AE%97%E6%9C%AF%E5%86%99)
小影看一本书,看过的页数与没看过的页数的比是3:7,再看12页,正好看了全书的2分之1,这本书有多少页?((只列式不计算)用算术写
小影看一本书,看过的页数与没看过的页数的比是3:7,再看12页,正好看了全书的2分之1,这本书有多少页?(
(只列式不计算)用算术写
小影看一本书,看过的页数与没看过的页数的比是3:7,再看12页,正好看了全书的2分之1,这本书有多少页?((只列式不计算)用算术写
已看是全书的3\(3+7)=7/10
12÷(1/2-3/10)=60(页)
好吧,我计算了= =,保证正确,你自己算看看吧.
啊
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