①8.75- 8.57+(11.25- 1.43)
②0.999×0.7+0.111×3.7
③875×0.25+ ×76-8.75
④2018×2018-2017×2019
⑤4123+3412+2341+1234
⑥199÷
⑦×2020
⑧
⑨
⑩