2+3
2+3*4
3*4+5
(2+3)*4
(3*(2+4)/(5+1))-2
(5+3)^(2+1)^2
2+3*4^5*6+7
((3^2-4*1*2)^(1/2)-3)/(2*1) 
((2-3)^((4+1)*5)/6-(2-4)*7)-8