[问答题]计算,其中Ω为球体x2+y2+(z-1)2≤
[问答题]计算
[单选题]与下列哪个数最接近?( )A.0.75B.0.55C.0.92D.1.1
[单选题]已知,则(a-b)2+(b-c)2+(a-b)(b-c)的值为( )。A.2B.4C.8D.16