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

Toán Lớp 6: 210 – 5 . x = 200 210 : x – 10 = 20 210 – 5 . ( x -10 ) = 200 (2x+1) :7 = 2 mũ 3 + 3 mũ 2

Toán Lớp 6: 210 – 5 . x = 200
210 : x – 10 = 20
210 – 5 . ( x -10 ) = 200
(2x+1) :7 = 2 mũ 3 + 3 mũ 2

Comments ( 2 )

  1. Giải đáp + Lời giải và giải thích chi tiết:
    a) 210-5\timesx=200
    =>5\timesx=210-200
    =>5\timesx=10
    =>x=10:5
    =>x=2
    Vậy x=2
    b) 210:x-10=20
    =>210:x=20+10
    =>210:x=30
    =>x=210:30
    =>x=7
    Vậy x=7
    c) 210-5\times(x-10)=200
    =>5\times(x-10)=210-200
    =>5\times(x-10)=10
    =>x-10=10:5
    =>x-10=2
    =>x=2+10
    =>x=12
    Vậy x=12
    d) (2x+1):7=2^3+3^2
    =>(2x+1):7=8+9
    =>(2x+1):7=17
    =>2x+1=17\times7
    =>2x+1=119
    =>2x=119-1
    =>2x=118
    =>x=118:2
    =>x=59
    Vậy x=59

  2. 210 – 5 . x = 200
    => 5 . x = 210 – 200 = 10
    => x = 10 : 5= 2
    210 : x – 10 = 20
    => 210 : x = 20 + 10 = 30
    => x = 210 : 30 = 7
    210 – 5.( x – 10) = 200
    => 5.( x – 10) = 210 – 200 = 10
    => x – 10 = 10 : 5 = 2
    =>x = 2 + 10 = 12
    ( 2x + 1) : 7 = 2^{3} + 3^{2}
    => ( 2x + 1) : 7 = 8 + 9 = 17
    => 2x + 1 = 17 . 7 = 119
    => 2x = 119 – 1 = 118
    => x = 59
     

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