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

Toán Lớp 6: 5 mũ x cộng 2 trừ 5 mũ x bằng 3 .10 mũ 3

Toán Lớp 6: 5 mũ x cộng 2 trừ 5 mũ x bằng 3 .10 mũ 3

Comments ( 2 )

  1. 5^(x + 2) – 5^x = 3 . 10^3
    5^x . 5^2 – 5^x = 3 . 1000
    5^x . (5^2 – 1) = 3000
    5^x . 24 = 3000
    5^x = 3000 : 24
    5^x = 125
    5^x = 5^3
    => x = 3
    Vậy x = 3

  2. Lời giải chi tiết:
    5^(x+2)-5^x=3.10^3
    =>5^(x+2)-5^(x)=3.1000
    =>5^x.(25-1)=3000
    =>5^(x).24=3000
    =>5^x=3000:24
    =>5^x=125
    =>5^x=5^3
    =>x=3
    Vậy x=3

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

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