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

Toán Lớp 9: Giải phương trình sau: 4.(1/12)+10.1/x=1

Toán Lớp 9: Giải phương trình sau:
4.(1/12)+10.1/x=1

Comments ( 2 )

  1. 4 . 1/12 + 10 . 1/x = 1
    <=> 4/12 + 10/x = 1
    <=> 1/3 + 10/x = 1
    <=> 10/x = 1 – 1/3
    <=> 10/x = 2/3
    <=> x = 15
    Vậy phương trình có tập nghiệm S = { 15 }

  2.        $4.(\frac{1}{12})$ $+$ $10.\frac{1}{x}$ $=$ $1$
    $ĐK$ $x$ $\neq$ $0$
    $⇔$ $\frac{1}{3}$ $+$ $\frac{10}{x}$ $=$ $1$ 
    $⇔$ $\frac{x}{3x}$ $+$ $\frac{30}{3x}$ $=$ $1$
    $⇔$ $\frac{x+30}{3x}$ $=$ $\frac{3x}{3x}$
    $⇔$ $\frac{-2x}{3x}$ $=$ $\frac{-30}{3x}$
    $⇔$ $-2x$ $=$ $-30$
    $⇔$ $x=15$

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

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