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

Toán Lớp 5: Tính nhanh: a.17,6 – 5,3 + 16,8 – 7,6 + 15,3 – 6,8 b.1579 x 23 + 74 x 1579 x 2 + 1579

Toán Lớp 5: Tính nhanh:
a.17,6 – 5,3 + 16,8 – 7,6 + 15,3 – 6,8
b.1579 x 23 + 74 x 1579 x 2 + 1579

Comments ( 2 )

  1. Tính  nhanh:
    a.17,6 – 5,3 + 16,8 – 7,6 + 15,3 – 6,8
    = (17,6-7,6)+(15,3-5,3)+(16,8-6,8)
    = 10+10+10
    = 30
    b.1579 × 23 + 74 × 1579 × 2 + 1579
    = 1579 × (23+74+2+1)
    = 1579 × 100
    = 15790
    #Karis257

  2. $ a) 17,6 – 5,3 + 16,8 – 7,6 + 15,3 – 6,8 = ( 17,6 – 7,6 ) + ( 15,3 -5,3 ) + ( 16,8-6,8 ) = 10 + 10 + 10 = 10×3=30 $
    $ b) 1579 x 23 + 74 x 1579 x 2 + 1579 = 1579x (23+74+2+1 ) = 1579×100=157900 $

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