两列火车从相距千米的两城相向而行,甲列车每小时行千米,乙列车每小时行千米,小时后,甲、乙两车还相距多少千米?
递等式计算:(能简便计算的用简便方法计算)(1)3.6×1.25+0.32÷0.4(2)0.45×78.2+20.8×0.45+0.45(3)14.5+27.3+12.7+45.5(4)(0.25+0.125)÷(0.75×0.4)(5)6500÷0.125÷0.8(6)[(3.8﹣2.5)×0.4﹣0.1]÷0.04.
8.6×10.1 5.6×(12.5﹣8.5÷0.85)[(8.1﹣5.6)×0.9﹣1]×0.4 8.25×4.08+0.75×4.08+4.081.84÷[(28.02+11.98)×(62.8﹣62.3)].
脱式计算,能简算的要简算.98.9×99 8.53﹣(2.25+3.53) 0.725÷0.5÷0.20.25×7×4×0.6 2.7×3.6+1.4×2.7 80.8×101﹣80.8.
下面各题怎样算简便就怎样算.3.28×4.6+6.72×4.6 0.25×1.25×0.49.73×2.8﹣4.73×2.8. 12.5×4+3.12÷1.225.2﹣(7.8﹣2.6)×1.3 14.08÷[0.8×(7.93﹣2.43)].
怎样简便就怎样算.①4.7+7.69+5.3+2.31 ②2000÷125÷8③57×101﹣57 ④125×32×25⑤86.5﹣(14.3﹣7.75) ⑥89.67+0.08﹣70.67.