Mathematics
Senior High
Solved
左辺から右辺にするにはどうすればいいのですか？
n!
1!·1!·(n-2)! *¹y¹·1-2=n(n−1)xy
係数が90 だから(n-1)=90
よってn-n-90=0
(n-10)(n+9)=0
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