3.6+4.8=
98.7÷100=
5.9-0.9=
2.03×10=
700÷25÷4=
86-0÷8=
9×1÷1×9=
725-78= 108×26= 546÷27=
678- 122-78
①7840万0.78亿 ②123-68+☆ 123- (68+☆) (☆>0)
③360个0.013个1和60个0.1 ④125×25×4×8125×8+25×4