直径是通过圆心且两端在圆上的直线. .
(1)45.7﹣29.25﹣0.75= .(2)2.25×2.25×32= .
计算:2013.05×601+1550×201.305+201305×2.44= .
4.76×3.8+1.5×5.24﹣2.3×4.76= .
2012×16﹣201.2×70+20120×0.1= .
0.87×101= . 0.8×0.8+0.8﹣0.8÷0.8= .