2 câu b và c aiii giúpppppppe mmmm vớii

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2 câu b và c aiii giúpppppppe mmmm vớii

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    `b)`

    `( x – 1/6 ) : ( – 4 )/15 = ( – 5 )/32`

    `=> x – 1/6 = ( – 5 )/32  . ( – 4 )/15`

    `=> x – 1/6 = 1/24`

    `=> x = 1/24 + 1/6`

    `=> x = 5/24`

    Vậy `x = 5/24`

    `c)`

    `1/2 – ( x – 2 )^2 = – 7/2`

    `=> ( x – 2 )^2 = 1/2 – ( – 7/2 )`

    `=> ( x – 2 )^2 = 1/2 + 7/2`

    `=> ( x – 2 )^2 = 4`

    `=> ( x – 2 )^2 = +- 2^2`

    `=> x – 2 = +-2`

    `TH1:`

    `x – 2 = 2`

    `=> x = 2 + 2`

    `=> x = 4`

    `TH2:`
    `x – 2 = – 2`

    `=> x = – 2 + 2`

    `=> x = 0`

    Vậy `x in { 4 ; 0 }`

    `#`Nguyencanhthinh`#`
    `@Hoidap247`

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