用你喜欢的方法计算．
①8.75﹣3.9+6.25﹣7.1         ②0.08+0.92×5﹣1.28            ③（7.4﹣1.5×2.8）÷0.16
④79÷125÷8                  ⑤3.87×9+3.87                 ⑥（15.6﹣8.3）×0.5÷12．