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

Toán Lớp 6: x^3×x^2=2^8÷2^3 3^x-3-3^2=2×3^2 Mn giúp e vs ạ ^^ ai lm nhanh + đúng e vote 5* ạ

Toán Lớp 6: x^3×x^2=2^8÷2^3
3^x-3-3^2=2×3^2
Mn giúp e vs ạ ^^
ai lm nhanh + đúng e vote 5* ạ

Comments ( 2 )

  1. x^3 . x^2 = 2^8 : 2^3
    => x^5 = 2^5
    => x = 2
    Vậy x = 2
    ———–
    3^{x-3} – 3^2 = 2 . 3^2
    => 3^{x-3} – 9= 18
    => 3^{x – 3} = 18 + 9
    => 3^{x – 3} = 27
    => 3^{x-3} = 3^3
    => x – 3 = 3
    => x = 3 + 3
    => x = 6
    Vậy x = 6

  2. Lời giải chi tiết:
    a) x^(3).x^2=2^8:2^3
    =>x^5=2^5
    =>x=2
    Vậy x=2
    b) 3^(x-3)-3^2=2.3^2
    =>3^(x-3)-9=2.9
    =>3^(x-3)=18+9
    =>3^(x+3)=27
    =>3^(x+3)=3^3
    =>x+3=3
    =>x=3-3
    =>x=0
    Vậy x=0

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