Mathematics
Senior High
Solved
ここの途中式を教えて下さい😢🙇🏻♀️
****** 3² (3-¹-1)
=1・3+2・
3-1
=-2(n-1)3"+1-6
-(2n-1)3 +1
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ここの途中式を教えて下さい😢🙇🏻♀️
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