780-80=
680-640=
360+240=
370+300=
72÷8=
0.125×16= 1.04×5= 7×12÷7×120=
18.8×20%= ×0.55= 123+﹣123+=
①7.4﹣6.62+20.6﹣13.38
②×+×
③(-+)÷
④2×0.8×12.5×50%
⑤÷(÷+)
⑥×[1÷(+)]