16×12+34 ×1 7-28= 909÷9-(520-502)×13:6= 755÷5+18×18-(89-73)×19= (22×44-11×20-10×10÷8=
16×12+34 ×1 7-28=192+578-28=742 909÷9-(520-502)×13:6=62 755÷5+18×18-(89-73)×19=171 (22×44-11×20-10×10÷8=735,5