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

Toán Lớp 5: 39.<18-x>=39 .<74-x>=0 .57=0 <5x-36>:18=13 x-36:18=12 3.x+5.x=40

Toán Lớp 5: 39.<18-x>=39
.<74-x>=0
.57=0
<5x-36>:18=13
x-36:18=12
3.x+5.x=40

Comments ( 2 )

  1. 39 . (18 – x) = 39
    (18 – x) = 39 : 39
    18 – x = 1
    x = 18 – 1
    x = 17
    $\text{Vậy}$ x = 17
    ____________________
    (x – 890) . (74 – x) = 0
    $\left[\begin{matrix} x-890=0\\ 74-x=0\end{matrix}\right.$
    $\left[\begin{matrix} x=0+890\\ x=74-0\end{matrix}\right.$
    $\left[\begin{matrix} x=890\\ x=74\end{matrix}\right.$
    $\text{Vậy}$ x = 890 ; x = 74 
    ___________________
    (x – 25) . 57 = 0
    (x – 25) = 0 : 57
    x – 25 = 0
    x = 0 + 25
    x = 25
    $\text{Vậy}$ x = 25
    _____________________
    (5x – 36) : 18 = 13
    (5x – 36) = 13 . 18
    5x – 36 = 234
    5x = 234 + 36
    5x = 270
    x = 270 : 5
    x = 54
    $\text{Vậy}$ x = 54
    ______________________
     x – 36 : 18 = 12
     x – 2 = 12
     x = 12 + 2
     x = 14
    $\text{Vậy}$ x = 14
    ______________________
     3x + 5x = 40
     8x = 40
     x = 40 : 8
     x = 5
    $\text{Vậy}$ x = 5

  2. Giải đáp + Lời giải và giải thích chi tiết:
    39.(18-x)=39
    =>18-x=1
    =>x=17
    (x-890)(74-x)=0
    =>x-890=0 hoặc 74-x=0
    =>x=890 hoặc x=74
    (x-25).57=0
    =>x-25=0
    =>x=25
    (5x-36):18=13
    =>5x-36=234
    =>5x=270
    =>x=54
    x-36:18=12
    =>x-2=12
    =>x=4
    3x+5x=40
    =>8x=40
    =>x=5

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

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