笔算下面各题53×71= ;39×15= ;78×34= 73×43= ;58×52= ;68×41=
用竖式计算.90-47= 59+26= 63-28= 37+46-54= 81-32-27= 42-34+57=
(3.75+4.1+2.35)×9.8 1.28+9.8+7.72+10.2
2.5×4.4 25×1.25×32
3.35×6.4×2+6.7×3.6 18.7-3.375-6.625
125×(8+0.8+0.08) 45÷〔78-(25+38)