王叔叔有一只手表,他发现手表比家里的闹钟每小时快 30秒.而闹钟却比标准时间每小时慢 30 秒,那么王叔叔的手表一昼夜比标准时间差多少秒?
脱式计算:(能简算的要简算)12.8+1.9+15.94; 7.69+(4.76﹣1.96);4.68+2.72+7.32; 25.06﹣2.65﹣8.35.
下面各题怎样算简便就怎样算88.51﹣9.06﹣0.94 132+16.4+268+23.6 3.028﹣20.44+66.972 55.27+8.236﹣5.27 64.6﹣3.46+5.4﹣6.54 64.3﹣18.75+15.7﹣11.25.
计算.(能简便的用简便法计算)4.25÷0.125÷8 2.5×(6.2﹣2.6)×0.4 76.2÷0.16﹣0.160.45与2.4的积除1.62,商是多少?
1.25×32 0.56+3.48+0.44+6.52 2.8×(2.25+28.5÷1.5)5.8×7.6+7.6×4.2 145.3﹣58.6﹣41.4 [(5.1﹣3.6)÷0.8﹣1]×0.09.
我会巧算.1.2×0.4+1.3×0.4 (1.25+0.36)×0.2 7.2×0.3+28×0.03 0.25×0.56×0.48×(2.5+0.125) 0.25×0.56×0.4 32.8+5.6+7.2 75.2﹣66.9﹣5.2.