Найдите значение выражения.5,4-3,1/х+х/2 при х=2,3; 4,6

1. х=2
5,4-3,1/2+2/2=5,4-1,55+1=3,85+1=4,85
2. х=3
5,4-3,1/3+3/2=5,4-1,1/3+1,5=54/10-4/3+15/10=165/30-40/30+45/30=170/30=17/3=5,2/3
3.
5,4-3,1/4+4/2=5,4-0,725+2=4,675+2=6,675
4.
х=6
5,4-3,1/6+6/2=5,4-31/60+6/2=54/10-31/60+3=324/60-31/60+3=293/60+3=4,53/60+3=7,53/60