连一连从8:30到13:20经过 小时 分.
直接写出得数.20×5.5= 0.77+0.33= (0.18+0.9)÷9= ×4÷×4=0.48+0.2= 4.4÷1.1= 101×1.01﹣101= ÷﹣÷=
竖式计算.50﹣4.09=1.25×0.72=0.98÷2.8=43.6÷2.6=(得数保留两位小数)
口算 ①= ②= ③0.125×16=④= ⑤0.72÷0.6= ⑥=
2220÷37= 47×67= 74×76=123123÷1001= 3456×9999= 489+507+505+492+497+509+5001111.5÷2.5 0﹣1﹣2+3+4﹣5﹣6+7+8﹣…﹣97﹣98+99+100.
口算:2.5×0.7×0.8= (2.5+0.9)×0.4= 42÷0.6= 5.6×1.01=3.9+1.01= 0.42= 4.8t﹣0.2t﹣2t= (5.5﹣5.5)÷3.3=1.52= 3.3﹣0.7﹣0.3=