24 ÷ ( 6 + 2 ) =...................

 $\left(5\ -\ 1\ \right)^{3\ }÷\ 4\ =\ 16$  

6 + 8 ÷ 2 + 2 ( 3 - 1 )= ...........................

4 ÷ 2 - 1 + 7

7 + 3 × 2 = 20