设区域D:x2+y2≤a2(a﹥0),又有∫∫D(x2+y2)dxdy
=8π,则a=____.
设区域D:x2+y2≤a2(a﹥0),又有∫∫D(x2+y2)dxdy
=8π,则a=____.
【正确答案】:a=2
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