Tìm x: a) x x 1/2 + x x 3/4 = 6/7 b) 2/5 x x – 1/4 x x = 1/3 c) 5/6 x x = 4/5

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Tìm x:
a) x x 1/2 + x x 3/4 = 6/7 b) 2/5 x x – 1/4 x x = 1/3
c) 5/6 x x = 4/5 d) 12/17 : x = 1/2

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  1. `a) x * 1/2 + x * 3/4 = 6/7`

    `x * ( 1/2 + 3/4 ) = 6/7`

    `x * 5/4 = 6/7`

    `x = 6/7 : 5/4`

    `x = 24/35.`

    `b) 2/5 x x – 1/4 x x = 1/3`

    `x * ( 2/5 – 1/4 ) = 1/3`

    `x * 3/20 = 1/3`

    `x = 1/3 : 3/20`

    `x = 20/9`

    `c) 5/6 x x = 4/5`

    `x = 5/6 : 4/5

    `x = 24/25.`

    `d) 12/17 : x = 1/2`

    `x = 12/7 : 1/2`

    `x = 24/17.` 

     

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  2. `a) x × 1/2 + x × 3/4 = 6/7`

    `=> x × (1/2 + 3/4) = 6/7`

    `=> x × 5/4 = 6/7`

    `=> x = 6/7 : 5/4`

    `=> x = 24/35.`

    `b) 2/5 × x – 1/4 × x = 1/3`

    `=> x × (2/5 – 1/4) = 1/3`

    `=> x × 3/20 = 1/3`

    `=> x = 1/3 : 3/20`

    `=> x = 20/9.`

    `c) 5/6 × x = 4/5`

    `x = 5/6 : 4/5`

    `x = 25/24.`

    `d) 12/17 : x = 1/2`

    `=> x = 12/17 : 1/2`

    `=> x = 24/17.`

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