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

Toán Lớp 7: Tính nhanh P = ( 5,23 . 0,7 +0,3 ) – 5,23 . ( 0.7 – 0,1 ) – 0,532

Toán Lớp 7: Tính nhanh P = ( 5,23 . 0,7 +0,3 ) – 5,23 . ( 0.7 – 0,1 ) – 0,532

Comments ( 2 )

  1. Nếu P=(5,23.0,7+0,3)-5,23.(0,7-0,1)-0,532
    =5,23.0,7+0,3-5,23.0,6-0,532
    =5,23.(0,7-0,6)+0,3-0,532
    =5,23.0,1+0,3-0,532
    =0,523+0,3-0,532
    =0,823-0,532
    =0,291.
    Nếu P=(5,23.0,7+0,3)-5,23.(0,7-0,1)-0,523
    =5,23.0,7+0,3-5,23.0,6-0,523
    =5,23.(0,7-0,6)+0,3-0,523
    =5,23.0,1+0,3-0,523
    =0,523+0,3-0,523
    =0,3.

  2. P = ( 5,23 . 0,7 +0,3 ) – 5,23 . ( 0.7 – 0,1 ) – 0,532
    = 5,23 . 0,7 + 0,3 – 5,23 . 0,7 + 5,23 . 0,1 – 0,532
    = (5,23 . 0,7 – 5,23 .0,7) + 0,3 + 0,523 – 0,532
    = 0,3 + 0,523 – 0,532
    = 0,3 + (0,523 – 0,532)
    = 0,3 – 0,009
    = 0,291

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

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