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

Toán Lớp 6: tính giá trị biểu thức 5 x 4 mũ 15 x 9 mũ 9 – 4 x 3 mũ 20 x8 mũ 9/5 x 2 mũ 9 x 6 mũ 19 – 7 x2 mũ 29 x 27 mũ 6

Toán Lớp 6: tính giá trị biểu thức
5 x 4 mũ 15 x 9 mũ 9 – 4 x 3 mũ 20 x8 mũ 9/5 x 2 mũ 9 x 6 mũ 19 – 7 x2 mũ 29 x 27 mũ 6

Comments ( 2 )

  1. (5 × 4^15 × 9^9 – 4 × 3^20 × 8^9)/(5 × 2^9 × 6^19 – 7 × 2^29 × 27^6)
    = (5 × (2^2)^15 × (3^2)^9 – 2^2 × 3^20 × (2^3)^9)/(5 × 2^9 × 2^19 × 3^19 – 7 × 2^29 × (3^3)^6)
    = (5 × 2^30 × 3^18 – 2^29 × 3^20)/(5 × 2^28 × 3^19 – 7 × 2^29 × 3^18)
    = (2^29 × 3^18(5 × 2 – 3^2))/(2^28 × 3^18(5 × 3 – 7 × 2))
    = (2^29 × 3^18)/(2^28 × 3^18)
    = 2

  2. (5 . 4^15 . 9^9 – 4 . 3^20 . 8^9)/(5 . 2^9 . 6^19 – 7 . 2^29 . 27^6)
    = (5 . 2^30 . 3^18 – 2^2 . 3^20 . 2^27)/(5 . 2^9 . 2^19 . 3^19 – 7. 2^29 . 3^18)
    = (5 . 2 . 2^29 . 3^18 – 3^2 . 3^18 . 2^29)/(5 . 2^28 . 3^18 . 3 – 7 . 2^28 . 2 . 3^18)
    = (2^29 . 3^18 (5 . 2 – 3^2))/(2^28 . 3^18 . (5 . 3 – 7 . 2))
    = (2 . (10 – 9))/(15 – 14)
    = (2 . 1)/1
    = 2

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

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