a (3/7+1/2)^2 b 1/2.3/4+1/4.1/2 c 10^8:2^8 d

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1. a, `(3/7 + 1/2 ) ^2`

   = `(6/14 + 7/14 ) ^2`

   = `13/14 ^2`

   = `169/196`

   b. `1/2 . 3/4 + 1/4 . 1/2`

   = `1/2 . (3/4 + 1/4 ) `

   = `1/2 . 1`

   = `1/2`

   c. `10^8 : 2^8`

   = `(10 : 2)^8`

   = `5

   ^8`

   = `390625`

   d. `√x = 7/9`

   `(√x)² = (7/9)²`

   `x = 49/81`

   Vậy `x= 49/81`

    

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2. Đáp án:

    

   Giải thích các bước giải:

   `a)`

   `(3/7 + 1/2)^2`

   `=(6/14 + 7/14)^2`

   `=(13/14)^2`

   `=169/196`

   `b)`

   `1/2 × 3/4 +1/4 × 1/2`

   `=1/2 × (3/4 + 1/4)`

   `=1/2 × 4/4`

   `=1/2 × 1`

   `=1/2`

   `c)`

   `10^8 : 2^8`

   `=(10 : 2)^8`

   `=5^8`

   `=390625`

   `d)`

   `sqrt\{x} = 7/9`

   `⇒x = (7/9)^2 = 49/81`

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