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

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`