giúp tớ với ạ cảm ơn mn

`2) 3/5 + |(-4)/3| - 1/2 + (-1)/4`

`= 3/5 + 4/3 - 1/2 - 1/4`

`= 36/60 + 80/60 - 30/60 - 15/60`

`= (36+80-30-15)/60`

`= 71/60`

`5) 1/sqrt{36} + sqrt{25}/6 - sqrt{0,81}`

`= 1/6 + 5/6 - 0,9`

`= 1-0,9`

`= 0,1`

`8) (2/3)^3 + sqrt{49/81} - |-7/3| : 3`

`= 8/27 + 7/9 - 7/3 : 3`

`= 8/27 + 7/9 - 7/3 * 1/3`

`= 8/27 + 7/9 - 7/9`

`= 8/27`

`11) sqrt{4/9} + ((-1)/2)^3 - |(-3)/7| * 7/8`

`= 2/3 - 1/8 - 3/7 * 7/8`

`= 2/3 - 1/8 - 3/8`

`= 2/3 - 1/2`

`= 1/6`

`14) ((-4)/8)^3 : 0,75 - sqrt{49/169}`

`= ((-1)/2)^3 : 3/4 - 7/13`

`= -1/8 : 3/4 - 7/13`

`= -1/8 * 4/3 - 7/13`

`= -1/6-7/13`

`= -55/78`

`17) sqrt{0,25} . 2^4 - 4/9 : sqrt{16/25}`

`= 0,5 . 16 - 4/9 : 4/5`

`= 8 - 4/9 * 5/4`

`= 8-5/9`

`= 67/9`

`20) sqrt{0,36} * sqrt{25/16} + |(-3)/4| . 0,(3)`

`= 0,6 . 5/4 + 3/4 . 1/3`

`= 3/5 * 5/4 + 1/4`

`= 3/4 + 1/4`

`= 1`