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

Toán Lớp 4: A. X+X*99=23000. B . 25:x+15:x=8

Toán Lớp 4: A. X+X*99=23000. B . 25:x+15:x=8

Comments ( 2 )

  1. a) x+x×99=23000
    x×1+x×99=23000
    x×(1+99)=23000
    x×100=23000
    x=23000:100
    x=230
    b) 25:x+15:x=8
    (25+15):x=8
    40:x=8
    x=40:8
    x=5
    @Sú

  2. $x + x \times 99 = 23000^{}$
    ⇔ $x + 99x = 23000^{}$ 
    ⇔ $100x = 23000^{}$ 
    ⇔ $x = 230^{}$ 
    $25:x+15:x=8^{}$
    ⇔ $\dfrac{25}{x}$ + $\dfrac{15}{x}$ $= 8^{}$ 
    ⇔ $\dfrac{40}{x}$ $= 8^{}$ 
    ⇔ $x = 5^{}$ 

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

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