能简算的要用简便方法计算
①3.28×0.46+6.72×0.46            
②9.73×2.8﹣4.73×2.8
③1.35×6.2+5.79÷0.3              
④27.9+3.6×2.5÷0.48
⑤0.6×（5.3﹣1.7）÷0.9          
⑥6.4÷[（4.3+2.1）÷0.8]．