用竖式计算. 504×7= 213×5= 650×4= 1300×9=
计算下面各题,能简算的请用简便方法计算. 8.38+9.43+6.625.86﹣1.77+2.5447.2+8.6﹣7.2 28.6﹣3.8﹣14.6﹣6.28﹣2.6﹣1.777.4+0.93﹣4.36 17.34﹣(9.8+6.34)0.93+5.45+7.07+4.55.
计算下面各题. 13.4×5.6×2.5 6.75×0.12+15.73 3.25×7.4﹣8.5 1 8.7×3.3﹣15.2×2.6 45.2﹣14.36+17.6 9.43×61+24.77.
7.6+3.9÷0.3 (14.7+5.6)÷7 62.7÷8÷1.25 4.6÷0.08﹣20.8.
递等式计算,能简便的就简便计算. (1)9.2×1.5÷3 (2)19.03﹣5.53﹣0.37 (3)86÷(8.6×25) (4)6.3×101﹣6.3 (5)1.8÷3.6×(0.9+1.2) (6)12÷0.125 (7)18.21+25.93+1.79 (8)59.6×18+59.6×81+59.6 (9)33.02﹣(148.4﹣90.85)÷2.5 (10)[33.3﹣(17.4+3.1)]×6.05.
下面各题,怎样简便就怎样算. (1)2.15+8.73+1.27+7.85(2)11.87﹣(8.2+1.87)(3)5.42﹣3.87﹣1.13 (3)4.38﹣1.56+0.62﹣0.44(4)0.4×270×2.(6)(40+1.25)×8 (7)(12.5﹣0.05)×8(8)2.6×8.5+8.5×7.4(9)9.9×6.9﹣6.9×3.9 (10)5.6×99+5.6(11)2.5×(1.9+1.9+1.9+1.9)(12)7.2÷1.25÷8.