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

Toán Lớp 6: 1.2.3.4 + 2.3.4.5 + … + 18.19.20.21 + 19.20.21.22

Toán Lớp 6: 1.2.3.4 + 2.3.4.5 + … + 18.19.20.21 + 19.20.21.22

Comments ( 2 )

  1. Giải đáp:
    1\times2\times3\times4+…+19\times20\times21\times22=28728
    Lời giải và giải thích chi tiết:
    Đặt:
    A=1\times2\times3\times4+…+19\times20\times21\times22
    5A=1\times2\times3\times4\times5+…+19\times20\times21\times22\times5
    5A=1\times2\times3\times4\times(5-0)+…+19\times20\times21\times22\times(23-18)
    5A=1\times2\times3\times4\times5-0+…+19\times20\times21\times22\times23-18\times19\times20\times21\times22
    5A=18\times19\times20\times21
    A=(18\times19\times20\times21)/5
    A=18\times19\times4\times21
    A=28728

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