计算下面各题．
15.6×0.8+6.12÷3.49.4×[6.2÷（7﹣6.8）]
0.48×4.2+5.8×0.48[0.45×（4.5+3.7）]÷1.2．
脱式计算
32×0.16×2.5×1.25
6.4×4.2﹣4.2×
（0.3+
）×1.6﹣
9÷[1﹣（+
）]．
计算下面各题，能简便的要简便计算．
16.2﹣4.65+5.356000÷12513.7﹣6.38+6.3﹣4.32
（45+405÷27）×120 125×250×32333×444+666×778．
简便运算．
（1）0.54×40.5﹣0.44×40.5=
（2）1.4×2.5×40= ．
计算．
①7.5×1.8÷0.15 ②12.4÷0.8﹣9.64 ③7.65×2.4+1.64
④12.3﹣10.8÷4.5 ⑤44.28÷4.1÷0.9+2.5 ⑥39.87×4.58﹣29.87×4.58．