笔算下面各题.(带△的要验算)81×37= 90×18= △29×74=848÷4= 286÷7= △605÷6=
68×34+68×67﹣68.
26×49+26.
用简便方法计算:24.6×4.6+246×0.44+24.6.
①25.74﹣2.36﹣7.64 ②0.75×0.25×4 ③8.4÷0.25÷4④2.8×3.6+1.4×2.8.
96×101.