李霞买了0.50元和0.80元的贺卡共50张,总共用去29.5元钱,问两种价钱的贺卡各有多少张?
计算下面各题,怎样简便就怎样算.1.29+3.7+0.71+6.3 23.4﹣8.54﹣1.46 6.75×0.5+4.8619×3.6﹣3.6×9 2.5×1.8×0.04 10.24÷1.25÷8.
用自己喜欢的方法计算.(1)99×0.79+0.79 (2)÷+× (3)2012× (4)10.58﹣(5.58﹣) (5)(1﹣0.05)÷0.19+0.1 (6)5.25×[1﹣(0.45﹣0.15)].
计算下面各题(能用简便方法的用简便方法).22.7×1.25×O.8 3.91×2.8+6.09×2.89.83×(3.8﹣2.3)+1.5×6.17 3.6×51+36×4.97.8×9.9 5.4﹣3.2+12.6﹣7.87.2×4.1﹣9.5÷7.6 8.125×3+7×8.125(0.75×27.5﹣3.405)÷0.8 [0.16+(3﹣1.272)÷1.2]×1.25.
计算下面各题,能简算的要简算.8.5×(2.36+2.42)÷0.25 3.9÷1.3×6 4.25×6.3+3.7×4.25205×99 25.6﹣7.49﹣2.51 2.5﹣(6.8﹣4.9)×0.8.
下面各题怎样简便就怎样算.(1)3.7×99+3.7 (2)×7.7+3.3×0.75﹣75%(3)5.93+0.64+0.07+0.36 (4)(7.9﹣3.06÷0.68)×1.5(5)78÷2.5÷0.4 (6)105×(+)