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【OG20-P158-80题】
If ( 13 +14 +15 +16 )=r(19 +112 +115 +118 ) ,then r=
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(1/9+1/12+1/15+1/18)*3=1/3+1/4+1/5+1/6
所以r=3
606244v
选的a，看反了。。
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2023-05-06 16:50:36
1048993hyug
妈呀 我还算了。。。傻了
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2022-10-16 23:34:40
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问题求解PS
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