口算.2.5×0.6×0.4= 1.25×0.7×0.8=0.1×0.2×0.3= 5.4﹣0.4×5=0.26×0.2×50= 0.5×0.75×4=12.5×0.1×0.8= 0.4×0.1×0.25=
笔算下列各题. 32×75= 35×19= 27×42=
543+545+547+549+551= × .
某动画片共208集,每集l3分钟,播放完整部该动画片需要多少分钟?
162×21 64×321 713×15.
笔算下列各题. 336×4= 207×5= 270×8=