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

Toán Lớp 6: A , 2x – 5 = 3³ B , 2 ( x – 1 ) + 3 ( x – 5 ) = 3 C , 3² × – ⁵ = 81. 3

Toán Lớp 6: A , 2x – 5 = 3³
B , 2 ( x – 1 ) + 3 ( x – 5 ) = 3
C , 3² × – ⁵ = 81. 3

Comments ( 1 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
    a, 2x-5=3^3
    2x-5=27
    2x=25+7
    2x=32
    x=32:2
    x=16
    b, 2.(x-1)+3.(x-5)=3
    2x-2+3x-5=3
    (2x+3x)-(2+5)=3
    5x-7=3
    5x=7+3
    5x=10
    x=10:5
    x=2
    3^(2x-5)=81.3
    3^(2x-5) = 3^4 . 3
    3^(2x-5)=3^5
    => 2x-5=5
    => 2x=5+5
    => 2x=10
    => x=10:2
    => x=5

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

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