选择合适的方法计算2.47×6.5+7.53×6.5 66.96÷72﹣0.87 76.1×17﹣76.1×765.7×0.35+0.15 29.6÷7.4×1.2 0.65×101.
用简便的方法计算下面各题4,5×0.9+5.5×0.9 7.69×101 2.5×(7.2×0.04)72×l.25 0.26×10.1﹣0.26×0.1 0.25+39×0.25.
简便计算.1﹣().
①(23+27)×(77+73)×25.②19×27+190×5+19×23.③23×2×24+25×4×2+27×1×8+25×8×1.④1250×32×25.
杯盖盖哪个杯子?(连一连)
巧算.(1)12.5×3.9×8(2)4.3×2.5×0.4(3)0.125×6.4(4)36×0.25.