脱式计算，能简便的要简便计算

①6.17×3.6+6.17×6.4

②0.25×0.39×4

③4.7×102-47×0.2

④9.07-8.5+3.4

⑤15.6+18.9÷1.4

⑥3.79+0.125÷0.8