Mathematics
Senior High
シグマを用いないで各項を書き並べて書けという問題なのですが、なぜこういう式になるのかわかりません💦解説お願いします🙏
)
xf2=12
+5・6 +6.7 +78+ 8・9 + 9・10+10.11
=2+6+12+20 + 30 + 42 + 56 + 72 + 90+110
10
(+85
213 (1) k(k+1)
=1.2+2·3+3.4+4.5
k=1
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