a. -17/14 : -34/7 + 10/3 (1/5 - 5/4) - 6/5 (1/3 - 5/6) b. 21/10 : (12/5 - 9/10) (-4/7) - 3/2(1/6 - 7/12) +1/5 (3/2 - 1/4) c. (0,125) ^2 . 8^4

$#Hy$

`a. (-17)/14 : (-34)/7 + 10/3 (1/5 - 5/4) - 6/5 (1/3 - 5/6) `
`= (-17)/14 . (-7)/34 + 10/3 . (4/20 - 25/20) - 6/5 (2/6 - 5/6) `
`= 1/4 + 10/3 . (-21)/20 - 6/5 . ((-3)/6)`
`= 1/4 + ( (-7)/2 ) + 3/5`
`= 5/20 + ( (-70)/20 ) + 12/20`
`= -53/20`

`b. 21/10 : (12/5 - 9/10) .(-4/7) - 3/2(1/6 - 7/12) +1/5 (3/2 - 1/4)`
`= 21/10 : (24/10 - 9/10) . (-4/7) - 3/2 . (2/12 - 7/12) + 1/5 . (6/4 - 1/4)`
`= 21/10 : 15/10 . (-4/7) - 3/2 . (-5)/12 + 1/5 . 5/4`

`= 21/10 . 10/15 . (-4/7) + 5/8 + 1/4`

`= -4/5 + 5/8 + 1/4`

`= -32/40 + 25/40 + 10/40`

`= 3/40`

`c. (0,125) ^2 . 8^4`

`= (1/8)^2 . 8^4`

`= 1/8 . 1/8 . 8 . 8 . 8 . 8`

`= (1/8 . 8) . (1/8 . 8) . 8 . 8`

`= 1 . 1 . 8 . 8`

`= 64`