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

Toán Lớp 7: T=45^10.5^20 / 75^15 giúp vs ak

Toán Lớp 7: T=45^10.5^20 / 75^15 giúp vs ak

Comments ( 2 )

  1. T=$\dfrac{45^{10}.5^{20}}{75^{15}}$ 
    T=$\dfrac{(5.9)^{10}.5^{20}}{(25.3)^{15}}$ 
    T=$\dfrac{9^{10}.5^{10}.5^{20}}{25^{15}.3^{15}}$ 
    T=$\dfrac{3^{20}.5^{30}}{5^{30}.3^{15}}$ 
    T=$\dfrac{3^{15}.3^5.5^{30}}{5^{30}.3^{15}}$ 
    T=3^5
    T=243

  2. Lời giải và giải thích chi tiết:
    -Ta có: T = ( 45^10 . 5^20 )/( 75^15 )
    => T = ( 9^10 . 5^10 . 5^20 )/( 25^15 . 3^15 )
    => T = ( (3^2)^10 . 5^30 )/( (5^2)^15 . 3^15 )
    => T = ( 3^20 . 5^30 )/( 5^30 . 3^15 )
    => T = 3^5
    => T = 243 

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