直接写出得数．= = == = == = == = =
计算下面各题，能简算的要简算．（1）9.86﹣3.4÷1.7×1.3 （2）0.36×3.9+3.9×1.64 （3）7.23﹣（2.8+1.23）（4）1.64×2.5+2.1÷0.6 （5）2.4×（0.85÷1.7）﹣1.08 （6）0.04×[（17.6﹣14.1）÷1.4]．
脱式计算，能简算的要简算．2.65×1.7+1.35×1.7 23.4÷7.8﹣2.10.75×18÷0.15 2.5×3.2×1.25．
下面各题，怎样算简便就怎样算．6.2﹣0.54÷1.8×5 3.6×0.81+0.36×1.9 27.6﹣11.31﹣5.69 4.05÷[1.8×（3.36﹣2.86）]．
用你喜欢的方法计算．（1）3.6×0.4+35.7÷7（2）18×0.45+18×0.55（3）50.8÷（26.5﹣7.5×3）（4）1.5×[0.72÷（4.2÷0.7）]．
用递等式计算．（写出必要的计算过程，能简便计算的用简便方法计算）7.9×12.5 25.38﹣1.43﹣4.38﹣4.5790+10÷0.4×2.5 0.8×0.4×（7.6×1.25）×2.52.3×0.48+0.48×8.7﹣0.12×4； 0.1﹣0.1×[0.01÷（；1﹣0.9）]．
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