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

Toán Lớp 6: 3 mũ 2 . 10 mũ 3 – [ 13 mũ 2 – ( 5 mũ 2 . 4 + 2 mũ 2 . 15 ) ] – 10 mũ 3 tính

Toán Lớp 6: 3 mũ 2 . 10 mũ 3 – [ 13 mũ 2 – ( 5 mũ 2 . 4 + 2 mũ 2 . 15 ) ] – 10 mũ 3
tính

Comments ( 2 )

  1. Giải đáp:
     =7991
    Lời giải và giải thích chi tiết:
    3^2. 10^3-[13^2-(5^2.4+2^ 2 .15)]-10^3
    =9.1000-[169-(25.4+4.15)]-1000
    =9.1000-{169-[4(25+15)]}-1000
    =9.1000-{169-[4.40]}-1000
    =9.1000-{169-160}-1000
    =9.1000-9-1000
    =1000(9-1)-9
    =1000.8-9
    =8000-9
    =7991

  2. 3^2 . 10^3 – [13^2 – ( 5^2 . 4 + 2^2 . 15 )] – 10^3
    = 9 . 1000 – [169 – (25 . 4 + 4 . 15)] – 1000
    = 9000 – [169 – (100 + 60)] – 1000
    = 9000 – [169 – 160] – 1000
    = 9000 – 9 – 1000
    = 8991 – 1000
    = 7991
    #dtkc
     

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