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

Toán Lớp 6: 1.tìm x,biết a, -1/3-x=5/6 b, 7/5-x:3/2=0,5 c,3/4.x+5/6.x=5/2

Toán Lớp 6: 1.tìm x,biết
a, -1/3-x=5/6
b, 7/5-x:3/2=0,5
c,3/4.x+5/6.x=5/2

Comments ( 2 )

  1. Lời giải và giải thích chi tiết:
    1. Tìm x
    a)
    -1/3-x=5/6
    =>x=-1/3-5/6
    =>x=-2/6-5/6
    =>x=-7/6
    Vậy x=-7/6
    b)
    7/5-x:3/2=0,5
    =>7/5-x . 2/3=5/10
    =>x . 2/3=7/5-5/10
    =>x . 2/3=14/10-5/10
    =>x . 2/3=9/10
    =>x=9/10 :2/3
    =>x=9/10 . 3/2
    =>x=27/20
    Vậy x=27/20
    c)
    3/4 . x+5/6 . x=5/2
    =>(3/4+5/6).x=5/2
    =>(9/12+10/12).x=5/2
    =>19/12 . x=5/2
    =>x=5/2:19/12
    =>x=5/2 . 12/19
    =>x=30/19
    Vậy x=30/19

  2. a,(-1)/3-x=5/6
    => x=(-1)/3-5/6
    => x=(-2)/6-5/6
    => x=(-7)/6
    b, 7/5-x:3/2=0,5
    => 7/5-x:3/2=1/2
    => x:3/2=7/5-1/2
    => x:3/2=14/10-5/10
    => x:3/2=9/10
    => x=9/10 times 3/2
    => x=27/20
    c,3/4.x+5/6.x=5/2
    => x.(3/4+5/6)=5/2
    => x.(9/12+10/12)=5/2
    => x. 19/12=5/2
    => x=5/2:19/12
    => x=30/19

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

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