下列哪些是自然数,请把他们写在下边的横线上。340.5,35,25,40.23, 8.33, 6.2345, 234, 240.01
×+× +÷ 20﹣× 2.2×3.7+6.3×2.2.
直接写出得数.(1)4﹣4÷6= (2)992+99= (3)275÷4÷25(4)9×÷9×= (5)4.8×25%= (6)8××12.5=
计算下面各题,能简算的要简算:1488+1068÷89 4.5×25%+1.3×+2.2×0.25 250×+250× 1999+9992.
选择你喜欢的方法计算下列各题. 13.5﹣ 88×1.25×100÷4.4.
3.14×43+7.2×31.4﹣150×0.314 2007+2008+2009+2008×97 4.1﹣2.56÷(0.18+0.62) .