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

Toán Lớp 6: ( 11 . 3^7 . 9^11 – 9^15 ) : (2 . 3^14)^2

Toán Lớp 6: ( 11 . 3^7 . 9^11 – 9^15 ) : (2 . 3^14)^2

Comments ( 2 )

  1. (11.3^7 .9^11-9^15):(2.3^14)^2
    =[11.3^7 .(3^2)^11-(3^2)^15]:(2.3^14)^2
    =(11.3^7 .3^22 -3^30):(2^2 .3^28)
    =(11.3^29-3^30):(2^2 .3^28)
    =[(3^29(11-3)]:(2^2 .3^28)
    =3^29 .8:4.3^28
    =3.8:4.1
    =24:4
    =6

  2. Lời giải và giải thích chi tiết:
    (11 . 3^7 . 9^11 – 9^15)/((2 . 3^14)^2)
    = (11 . 3^7 . 3^22 – 3^30)/(2^2 . 3^28)
    = (11 . 3^29 – 3^30)/(2^2 . 3^28)
    = (3^29 . (11 – 3))/(4 . 3^28)
    = (3^29 . 8)/(4 . 3^28)
    = 6

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

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