（1）原式= 45+24

                =69（2）原式=9+18

                =27（3）原式= 48-24

                =24

（4）原式=8÷4

                =2（5）原式=9×5

                = 45（6）原式=9×4

                =36

（7）原式=72-38

                =34（8）原式=36÷6

                =6（9）原式=7×9

                =63