Mathematics
Senior High
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ここまでやって計算がよくわからなくなりました。教えてください🙇‍♀️

35= (2)S=5.1+9.3+13.3+…+(4n+1)-37-1 5.3+9.32+…+(4n-3)-371+(Antl いい -25=5+4(3+32+ +3h-1)-(4n+1).3n 5+43-1 3(3h-1-1) -(4n+1)-3h = 5 + 2-3 (3 n-1-1)-4n3" -3h 5+2(3-3)-4n3n-3h

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