3)Tìm x a) x.(11 phần 5)mũ27 =(11 phần 5)mũ29 b) (2x-1)mũ2 = 1 phần 4

Question

3)Tìm x
a) x.(11 phần 5)mũ27 =(11 phần 5)mũ29
b) (2x-1)mũ2 = 1 phần 4

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Ben Gia 4 years 2020-10-15T23:05:28+00:00 2 Answers 128 views 0

Answers ( )

  1. Amity
    0
    2020-10-15T23:06:29+00:00
    Reply

    `a) x.(11/5)^{27} = (11/5)^{29}`

    `<=> x = (11/5)^{29} : (11/5)^{27}`

    `<=> x = (11/5)^2`

    `<=> x = 121/25`

    `b) (2x – 1)^2 = 1/4`

    `<=> |2x – 1| = 1/2`

    `<=>` \(\left[ \begin{array}{l}2x – 1 = \dfrac{1}{2}\\2x – 1 = -\dfrac{1}{2}\end{array} \right.\) 

    `<=>` \(\left[ \begin{array}{l}x = \dfrac{3}{4}\\x = \dfrac{1}{4}\end{array} \right.\) 

  2. Delwyn
    0
    2020-10-15T23:07:26+00:00
    Reply

    `a,x·(11/5)^27=(11/5)^29`

    `→x=(11/5)^29÷(11/5)^27`

    `→x=(11/5)^2=121/25`

    `b,(2x-1)^2=1/4`

    `→|2x-1|=1/2`

    `→2x-1=1/2` hoặc `2x-1=-1/2`

    `→2x=3/2` hoặc `2x=1/2`

    `→x=3/4` hoặc `x=1/4`

     

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