脱式计算下面各题(1)0.125×9.3×0.8; (2)9.83×1.5+1.5×0.17;(3)(12+23.1÷0.75)×0.4; (4)2.8×10.1;(5)[18.8﹣(4.5+2.7)]÷5; (6)50﹣13.5﹣6.5.