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

Toán Lớp 5: c3: tìm x 3-12:{x-5}=2 4+9:[2+7:{x-1}]=7 2×5-6:{2+3:x}=2×4

Toán Lớp 5: c3: tìm x
3-12:{x-5}=2
4+9:[2+7:{x-1}]=7
2×5-6:{2+3:x}=2×4

Comments ( 2 )

  1. 3 – 12 : (x-5) =2
    12 : (x-5) = 3 – 2 = 1
    x -5 = 12 : 1 =12
    x =12 +5= 17
    $\\$
    4 + 9 : [2 + 7 : (x-1) ] = 7
    9 : [ 2 +7 : (x-1) ]  = 7 -4  =3
    2 + 7 : (x-1) = 9 : 3 =3
    7 : (x-1) = 3 – 2 =1
    x – 1 = 7 : 1 = 7
    x = 7 +1 =8
    $\\$
    2 xx 5 – 6 :  (2+3  : x) = 2 xx 4
    10 – 6  : (2+3 : x) =8
    6 : (2+3 : x) = 10 – 8 =2
    2 +3 : x = 6 : 2 =3
    3 : x = 3 – 2 =1
    x = 3 : 1 =3
     

  2. a.
    <=> 12:(x-5)=3-2
    <=> 12:(x-5)=1
    <=> x-5=12
    <=> x=12+5
    <=> x=17
    b.
    <=> 4+9:[2+7/(x-1)]=7
    <=> 4+9: (2(x-1)+7)/(x-1)=7
    <=> 4+9: (2x-2+7)/(x-1)=7
    <=> 4+9: (2x+5)/(x-1)=7
    <=> 4+9xx (x-1)/(2x+5)=7
    <=> 4+(9x-9)/(2x+5)=7
    <=> (9x-9)/(2x+5)=7-4
    <=> (9x-9)/(2x+5)=3
    <=> 9x-9=3xx(2x+5)
    <=> 9x-9=6x+15
    <=> 9x-6x=15+9
    <=> 3x=24
    <=> x=8
    c.
    <=> 10-6:(2+3:x)=8
    <=> 10-6: (2x+3)/x=8
    <=> 10-6xx x/(2x+3)=8
    <=> 10-(6x)/(2x+3)=8
    <=> (6x)/(2x+3)=10-8
    <=> 6x=2xx(2x+3)
    <=> 6x=4x+6
    <=> 6x-4x=6
    <=> 2x=6
    <=> x=3

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