设∑为球面x2+y2+z2=a2,则∫∫(x2+y2+z2)dS=____.
设∑为球面x2+y2+z2=a2,则∫∫(x2+y2+z2)dS=____.
【正确答案】:∫∫(x2+y2+z2)dS=a2∫∫dS =a2•4πa2=4πa2
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