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

Toán Lớp 5: Tìm x hộ mk cái 25+x/49+x =3/5

Toán Lớp 5: Tìm x hộ mk cái
25+x/49+x =3/5

Comments ( 2 )

  1. (25 + x)/(49 + x) = 3/5
    ( 25 + x) xx 5 = ( 49 + x) xx 3
    125 + 5x = 147 + 3x
    125 + 5x – 3x = 147
    2x = 147 – 125
    2x = 22
    x = 22 : 2
    x = 11
     

  2. Giải đáp:
    $x=11$
    Lời giải và giải thích chi tiết:
    $\dfrac{25+x}{49+x}=\dfrac35\\\Rightarrow 5\times(25+x)=3\times(49+x)\\\Rightarrow 5\times25+5x=3\times49+3x\\\Rightarrow 125+5x=147+3x\\\Rightarrow 5x=147-125+3x\\\Rightarrow 5x=22+3x\\\Rightarrow 5x-3x=22\\\Rightarrow 2x=22\\\Rightarrow x=22:2\\\Rightarrow x=11$
    Vậy $x=11$

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

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