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

Toán Lớp 6: Tính nhanh 8.9.14+6.17.12+19.4.18

Toán Lớp 6: Tính nhanh
8.9.14+6.17.12+19.4.18

Comments ( 2 )

  1. 8.9.14+6.17.12+19.4.18
    =72.14 + 6.12.17+4.18.19
    =72.4+72.17+72.19
    =72.(4+17+19)
    =72.40
    =2880
    eech

  2. 8 . 9 . 14 + 6 . 17 . 12 + 19 . 4 . 18
    = 4 . 2 . 9 . 14 + 3 . 2 . 17 . 12 + 19 . 2 . 2 . 18
    = ( 4 . 9) . ( 2 . 14 ) + ( 3 . 12 ) . ( 2 . 17 ) + ( 19 . 2 ) . ( 2 .  18 )
    = 36 . 28 + 36 . 34 + 38 . 36
    = 36 . ( 28 + 34 + 38 )
    = 36 . 100
    = 3600
    #dtkc

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

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