Mathematics
Senior High
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(1) 5C2 になぜなるのですか。。？
10 次の式の展開式において, [ ]内に指定された項の係数を求めよ
10
(3)(3x+y)° [xy]
一(4)(2x-3y)[xy°]
10 (1) (3x+2の展開式の一般項は
5C, (3x)5-r2"=;C,35-r.2"x5-r
x° の項は r=2のときで, その係数は
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なるほど！ありがとうございます！！！