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

Toán Lớp 7: Tính nhanh nếu có thể 9 mũ 17 ×8 mũ 9 trên 6 mũ 24 × 3 mũ 12

Toán Lớp 7: Tính nhanh nếu có thể 9 mũ 17 ×8 mũ 9 trên 6 mũ 24 × 3 mũ 12

Comments ( 2 )

  1. (9^17 . 8^9)/(6^24 .3^12)
    = ((3^2)^17 . (2^3)^9)/(2^24 . 3^24 . 3^12)
    = (3^34 . 2^27)/(2^24 . 3^36)
    = (3^34 . 2^24 .2^3)/(2^24 . 3^34 .3^2)
    = (\cancel(3^34) . \cancel(2^24) .2^3)/(\cancel(2^24) . \cancel(3^34) .3^2)
    = (2^3)/(3^2)
    = 8/9

  2. (9^17xx8^9)/(6^24xx3^12)
    =(3^34xx2^27)/(2^24xx3^24xx3^12)
    =(3^34xx2^27)/(2^24xx3^36)
    =(1xx2^3)/(1xx3^2)
    =8/9

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

About Thúy Mai