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

Toán Lớp 4: Bài 4: a)424 x 60 + 425 x 40 b) (1 +3 + 5 + 7 + –..+97 + 99)x(23 x 3 – 23 x 2 – 23)

Toán Lớp 4: Bài 4:
a)424 x 60 + 425 x 40
b) (1 +3 + 5 + 7 + ……….+97 + 99)x(23 x 3 – 23 x 2 – 23)

Comments ( 2 )

  1. Bài 4:
    a) 424 x 60 + 425 x 40
      = 424 x (60+40)
      = 424 x 100
      = 42400.
    b) (1 +3 + 5 + 7 + ……….+97 + 99) x (23 x 3 – 23 x 2 – 23)
    = (1 +3 + 5 + 7 + ……….+97 + 99) x (23 x 3 – 23 x 2 – 23 x 1)
    = (1 +3 + 5 + 7 + ……….+97 + 99) x [23 x (3 – 2 – 1)]
    = (1 +3 + 5 + 7 + ……….+97 + 99) x (23 x 0)
    = (1 +3 + 5 + 7 + ……….+97 + 99) x 0
    = 0.
    Xin hay nhất !
    #nhombanchamhoc
     

  2. Giải đáp:
    a)424 x 60 + 425 x 40
      = 424 x (60+40)
      = 424 x 100
      = 42400
    b) (1 +3 + 5 + 7 + ……….+97 + 99)x(23 x 3 – 23 x 2 – 23)
       =(1 +3 + 5 + 7 + ……….+97 + 99)x{23 x (3-2-1)}
       =(1 +3 + 5 + 7 + ……….+97 + 99)x(23×0)
       =(1 +3 + 5 + 7 + ……….+97 + 99)x0
       =                        0

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