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1/6+1/66+1/176+1/336(简算)
人气：486 ℃　时间：2020-03-22 23:39:05
解答
1/6+1/66+1/176+1/336
=11/66+1/66+1/176+1/336
=12/66+1/176+1/336
=2/11+1/176+1/336
=32/176+1/176+1/336
=33/176+1/336
=3/16+1/336
=63/336+1/336
=64/336
=4/21
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