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

Toán Lớp 6: a) (2x -1)^3 = 8 b) (2/3)^x = (4/9)^4 c) (1/5)^x = (1/25)^3

Toán Lớp 6: a) (2x -1)^3 = 8
b) (2/3)^x = (4/9)^4
c) (1/5)^x = (1/25)^3

Comments ( 2 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
     a)
    (2x-1)^3=8
    →(2x-1)^3=2^3
    →2x-1=2
    →2x=2+1
    →2x=3
    →x=3/2
    Vậy x=3/2
    b)
    (2/3)^x=(4/9)^4
    →(2/3)^x=[(2/3)^2]^4
    →(2/3)^x=(2/3)^8
    →x=8
    Vậy x=8
    c)
    (1/5)^x=(1/25)^3
    →(1/5)^x=[(1/5)^2]^3
    →(1/5)^x=(1/5)^6
    →x=6
    Vậy x=6

  2. a)(2x-1)^3=8
    ⇒(2x-1)^3=2^3
    ⇒2x-1=2
    ⇒2x=3
    ⇒x=3/2
    Vậy x=3/2
    b)(2/3)^x=(4/9)^4
    ⇒(2/3)^x=[(2/3)^2]^4
    ⇒(2/3)^x=(2/3)^8
    ⇒x=8
    Vậy x=8
    c)(1/5)^x=(1/25)^3
    ⇒(1/5)^x=[(1/5)^2)]^3
    ⇒(1/5)^x=(1/5)^6
    ⇒x=6
    Vậy x=6.

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

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