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

Toán Lớp 9: 2\sqrt{ 4x-8 } -\dfrac{ 2 }{ 3 } \sqrt{ 9x-18 } = \sqrt{ 49x-98 } -10

Tháng Sáu 4, 2022 Toán học 1 Comment 0 views

Toán Lớp 9: 2\sqrt{ 4x-8 } -\dfrac{ 2 }{ 3 } \sqrt{ 9x-18 } = \sqrt{ 49x-98 } -10

Comments ( 1 )

  1. quynhmaithu
    quynhmaithu
    4 Tháng Sáu, 2022 at 4:47 chiều
    Reply
    ${ 2\sqrt{ 4x-8 } -\dfrac{ 2 }{ 3 } \sqrt{ 9x-18 } = \sqrt{ 49x-98 } -10}$  ${ĐKXĐ: x≥2}$
    ${⇔2\sqrt{ 4x-8 } -\dfrac{ 2 }{ 3 } \sqrt{ 9x-18 } – \sqrt{ 49x-98 }=  -10}$
    ${ ⇔2\sqrt{ 4(x-2) } -\dfrac{ 2 }{ 3 } \sqrt{ 9(x-2) } – \sqrt{ 49(x-2) }=  -10}$
    ${⇔ 4\sqrt{ x-2 } -2\sqrt{ x-2 } – 7\sqrt{ x-2 }=  -10}$
    ${ ⇔-5\sqrt{ x-2 }=  -10}$
    ${ ⇔\sqrt{ x-2 }=2}$
    ${⇔x – 2 = 4}$
    ${⇔x = 6 ,tm}$
      Vậy ${x=6}$

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

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