口算2.4×5= 2.44+3.6= 0÷a= 25×4÷25×4=12÷7= 3.14﹣2= 6÷0.3= 1÷+÷1=
①12.5×3.7×0.8 ②4.6×2.3+7.7×4.6③3.6+（5.7+3.8）÷0.5 ④3.6÷0.4﹣1.5×3⑤0.1÷0.2÷0.4 ⑥80.3﹣5.6×1.7．
脱式计算，能用简算的要简算．1.3×0.75×41.08÷1.8×1.250.4×1.9﹣1.80.82×0.25+1.18×0.25．
怎样简便就怎样算．0.125×4.78×80 2.8×3.6+1.4×2.8 （0.4+40）×2.578.7﹣17.7×3.6 18÷[0.3×（8﹣6.5）] 12.7+12.5+0.5．
用你喜欢的方法计算．0.6+0.94﹣0.208 4.85×1.25×8 （64﹣22.4÷1.4）×1.218.3﹣6.25﹣3.75 2.8×3.6+1.4×2.8 6.6÷〔14.5﹣（1.7+1.8）〕
直接写得数：0.002×100= 8÷100= 0÷100+72= 25×19×4=0.83﹣0.23= 4.8+0.12= 5﹣2.7= 3.6+7.65+6.4=
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