一圆锥形沙堆,测得它的底面积周长是12.56米,高0.6米,每立方米沙约重1.5吨,这堆沙约重多少吨?(得数保留一位小数)
下面各题能简便的要简便. 15﹣8.13﹣1.875.14+3.225﹣6.3023.95+5.36﹣1.95 13.67﹣(5.45+3.67)4.26+5.48﹣1.26+4.5214.67+25.91+15.33+4.09.
递等式计算:(能简算的用简便方法计算) (1)(5.81﹣2.09)×3.5 (2)2.5×8×0.5+40 (3)3.865+1.92+3.135+2.08 (4)5.8×6.1+3.2×6.1+6.1 (5)16÷0.25÷0.4 (6)(750﹣366)÷48×[25÷(210﹣209)].
用你喜欢的方法计算. 19.2÷2.4×3.212.5×0.32×0.5 14.3÷1.1﹣1.8 3.2×2.4+32×0.76.
(1)9.36+3.65+0.64 (2)1.3×(8.1﹣5.6) (3)7.2×9.8+0.2×7.2 (4)6.3×1.5﹣2.92.
计算下面各题,能简算的要简算. 12.5×16×0.5 4.8÷0.16÷0.3 48.7﹣32.76÷8.4 0.57×102.