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

Toán Lớp 5: tìm x: 1.27x ( x – 31)-32=76. 2.0,25x x + 32,6=34,65

Toán Lớp 5: tìm x:
1.27x ( x – 31)-32=76.
2.0,25x x + 32,6=34,65

Comments ( 2 )

  1. \text{1)}
    27 xx ( x -31) -32 = 76
    -> 27 xx ( x -31) = 76 +32
    -> 27 xx (x – 31) = 108
    -> x – 31 = 108: 27 =4
    -> x =4 +31
    -> x =35
    Vậy x = 35
    $\\$
    \text{2)}
    0,25 xx x +32,6 = 34,65
    -> 0,25 xx x = 34,65 – 32,6
    -> 0,25 xx x = 2,05
    -> x = 2,05 : 0,25
    -> x = 8,2
    Vậy x = 8,2

  2. 1)
    27×(x-31)-32=76
    =>27×(x-31)=76+32
    =>27×(x-31)=108
    =>x-31=108:27
    =>x=4+31
    =>x=35
    vậy x=35
    2)
    0,25×x+32,6=34,65
    =>0,25×x=34,65-32,6
    =>0,25×x=2,05
    =>x=2,05:0.25
    =>x=8,2
    vậy x=8,2

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

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