①810÷18+285
②8.5﹣1.89﹣0.11
③3÷-÷3
④3.05×40%×25
⑤48×(-)
⑥[÷(-)]×
523﹣23×7
4.97+6.38+5.03﹣4.38
60×()
×3.2+5.6×0.5+1.2×50%
()÷