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

Toán Lớp 5: $\frac{2009×2010+2000}{2011×2010-2020}$ làm nhanh giúp mik nhé

Toán Lớp 5: $\frac{2009×2010+2000}{2011×2010-2020}$
làm nhanh giúp mik nhé

Comments ( 2 )

  1. { 2009 × 2010 + 2000 }/{ 2011 × 2010 – 2020 }
    = { 2009 × 2010 + 2000 }/{ ( 2009 + 2 ) × 2010 – 2020 }
    = { 2009 × 2010 + 2000 }/{ 2009 × 2010 + 2 × 2010 – 2020 }
    = 2000/{ 4020 – 2020 }
    = 2000/{ 2000 }
     = 1

  2. (2009xx2010+2000)/(2011xx2010-2020)
    = (2009xx2010+2000)/((2009+2)xx2010-2020)
    = (2009xx2010+2000)/(2009xx2010+2xx2010-2020)
    = (2009xx2010+2000)/(2009xx2010+4020-2020)
    = (2009xx2010+2000)/(2009xx2010+2000)
    = 1
     

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