（1）原式=90×28-14

                =2520-14

                =2506（2）原式=75+420-14

                = 495-14

                = 481

（3）原式=60-26

                =31（4）原式=1500÷15

                =100

（5）原式=60÷1

                =60（6）原式=28+5

                =33