计算下面各题，能简算的要简算．
①0.65×101           ②76.43﹣5.33﹣4.67       ③3.4÷[7.8﹣（3.9+2.2）]
④13.7÷12.5÷0.8     ⑤3.25×8.4+6.75×8.4     ⑥[1.4×2﹣（0.65+0.55）]÷40．