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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 5: điền dấu 1999/2000–2000/2001

Toán Lớp 5: điền dấu
1999/2000……..2000/2001

Comments ( 2 )

  1. Ta có : 1999/2000 = ( 2000 – 1 )/2000 = 1 – 1/2000
               2000/2001 = ( 2001 – 1 )/2001 = 1 – 1/2001
    Mà 1/2000 > 1/2001 nên 1 – 1/2000 < 1 – 1/2001 hay 1999/2000 < 2000/2001
    Vậy , 1999/2000 | < | 2000/2001

  2. $\dfrac{1999}{2000}=1-\dfrac{1}{2000}$
    $\dfrac{2000}{2001}=1-\dfrac{1}{2001}$
    $1-\dfrac{1}{2000}<1-\dfrac{1}{2001}$ do $1=1, \dfrac{1}{2000}>\dfrac{1}{2001}$
    $⇒\dfrac{1999}{2000}<\dfrac{2000}{2001}$

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222-9+11+12:2*14+14 = ? ( )