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

Toán Lớp 6: a,11x -23+x=-143 b,345-5^x-3=14^2+24 c,11-(-53+x)=97

Toán Lớp 6: a,11x -23+x=-143
b,345-5^x-3=14^2+24
c,11-(-53+x)=97

Comments ( 2 )

  1. a, 11x – 23 + x = -143
    => 12x – 23 = -143
    => 12x = -120
    => x = -10
    Vậy x = -10
    b, 345 – 5^(x – 3) = 14^2 + 24
    => 345 – 5^(x – 3) = 220
    => 5^(x – 3) = 125
    => 5^(x-3) = 5^3
    => x – 3 = 3
    => x = 6
    Vậy x = 6
    c, 11 – (-53 + x) = 97
    => -53 + x = -86
    => x = -33
    Vậy x = -33

  2. Lời giải chi tiết:
    a) 11x-23+x=-143
    =>11x+x=-143+23
    =>12x=-120
    =>x=-120:12
    =>x=-10
    Vậy x=-10
    b) 345-5^(x-3)=14^2+24
    =>345-5^(x-3)=196+24
    =>345-5^(x-3)=220
    =>5^(x-3)=345-220
    =>5^(x-3)=125
    =>5^(x-3)=5^3
    =>x-3=3
    =>x=3+3
    =>x=6
    Vậy x=6
    c) 11-(-53+x)=97
    =>11+53-x=97
    =>53-x=97-11
    =>53-x=86
    =>x=53-86
    =>x=-33
    Vậy x=-33

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

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