Giải thích các bước giải:
`675+125+723-23`
`=(675+125)+(723-23)`
`=800+700`
`=1500`
--------------------------------------
`325.40+325.60-25.100`
`=325.(40+60)-25.100`
`=325.100-25.100`
`=100.(325-25)`
`=100.300`
`=30000`
--------------------------------------
`80+[37-(32+23)]`
`=80+[37-55]`
`=80+(-18)`
`=62`
----------------------------------------
`22.85+15.22-20200`
`=22.(85+15)-20200`
`=22.100-20200`
`=2200-20200`
`=-18000`
