Helllllkkllkkllllllll

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Helllllkkllkkllllllll

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    gọi x là số hs tặng 3 quyển, y là số hs tặng 5 quyển

    tổng hs là 42 :     x+y=42 => x= 42-y 

    cả lớp tặng 146 quyển :    3x+ 5y= 146  <=> 3(42-y)+5y=146  <=> 2y=20 <=> y=10

    y=10 => x=42-y= 32

     

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