（1）原式=13.94+0.5-2.4

                =12.04（2）原式=0.125×8×4×25

                =100

（3）原式=2.5+3.91÷1.7

               =2.5+2.3

               =4.8

（4）原式=4.5×[14.2+6.2]

                =4.5×20.4

                =4.5×（20+0.4）

                =91.8