Mathematics
Senior High
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この式の変形が出来ないので途中式を教えてください!

|| r(1 − r) +2r²(1 − r”−¹) − (2n − 1)r¹+¹(1 − r). 1-r .n+1 (2n-1) rn+2 (2n+1) rn+¹+r² tr 1-r —

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