∑のところの途中式が分かりません教えて欲しいです😓 - Clearnote

Mathematics

Senior High

10 monthsago

∑のところの途中式が分かりません教えて欲しいです😓

て, n≧2 のとき n n k=1 1-8-(1-1) +2 = (1+* -7)3+9-9

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