Mathematics
Senior High
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なんで15-2rになるんですか？
(2②) (2*? 一3?? の展開式の一般項は
sC(2z95-(一3ァ)7ー。C.25-(一3)'x5-テー
*? の項は ァヶニ3 のときで。 その係数は
sC。・2和3)?=ニ10・4・(一27)=ー1080
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