计算下面各题，能简算的要简算。 

①7.41+2.4+1.59+3.6    

②49×102﹣2×49    

③3600÷25÷4

④[780÷（129﹣114）]×32    

⑤76.72﹣（35.28+6.72）    

⑥8×23×125