1 . (3/4 )²= 9/16
2. (-3/4 )³= -27/64
3. ( 3 /5 )² * (3/5)⁴ / ( 3/ 5 )⁵= (3/5)⁶ : (3/5)⁶= 1/ (3/5)= 1* 5/3=5/3
4. ( 5/6 - 7/12 ) / (2/5 - 4/3 )= ( 10/12-7/12) / (6/15-20/15)= 3/12* -(15/14)=
=1/4* -15/14= -15/56
5.{[ ( 7/3 /( 3/ 5 + 1/ 3 )]² } / 3= {[ ( 7/3 : ( 3/ 5 + 1/ 3 )]² } : 3=
= {[ ( 7/3 : ( 9/1 5 + 5/15 )]² }: 3={[ ( 7/3 : 14/15]² }: 3=
=[ ( 7/3*15/14)]²: 3= (5/2)²*1/3=25/4*1/3= 25/12