压路机的前轮是圆柱形,轮宽1.5米,直径1.2米,前轮每分钟转动10周,每分钟前进多少米?每分钟压路多少平方米?
9.81×0.1+0.5×98.1+0.049×981.
灵活计算下面各题1.25×0.32×250 ×2009 ﹣÷﹣ 86×(﹣)×3.
25×12.5×32.
(1)2012×(2)×78+0.5×1.25﹣730÷80(3)56÷11×165÷7(4)(﹣)×28+4×7﹣3×7.
计算下列各题,能简便的要简便计算(+)×15×175.66×7.28﹣3.16×3.16﹣3.16×4.122012×0.875+201.2×1.25.