①25×280 ②51.27﹣8.66﹣1.27 ③78×115﹣78×14﹣78
④67×102 ⑤168×[(573﹣248)÷13] ⑥15.68+9.82﹣1.68+12.18
139×40×25
437×28 + 63×28
99×45
(90 + 25)×4
185×19 + 185
125×808