300-225÷5+145
480÷(144-960÷8)
200-(76+40×3)
201-[207-(659-583)]×6
202-720÷[(12+18)×3]
203-(75+240)÷(20-5)
①28×98+72×98
②5276-276×15
③866-375-25+144
④75+25×120
⑤78÷26+22×26
⑥7245÷(824-789)×90