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

Toán Lớp 8: Tính nhanh `199^2` `37 . 43`

Toán Lớp 8: Tính nhanh
199^2
37 . 43

Comments ( 2 )

  1. 199^2
    = (200-1)^2
    = 200^2 – 2 . 200 . 1 + 1^2
    =  40000 – 400 + 1
    = 39600 + 1
    =  39601
    37 . 43
    = (40-3)(40+3)
    = 40^2 – 3^2
    =  1600 – 9
    = 1591

  2. 199^2
    =(200-1)^2
    =200^2-2.200.1+1^2
    =40000-400+1
    =39601
    37.43
    =(40-3)(40+3)
    =40^2-3^2
    =1600 – 9
    =1591

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

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