(5*4)^(4*5)-56
## [1] 1.048576e+26
23-1*(8-12)
## [1] 27
56/8*(3+4)
## [1] 49
45-5*8+(8+9)
## [1] 22
a <- c(2,5,6,7) b <- c(1,0,9,8) c <- c(6,5,8,3)