Mathematics
Senior High
数2 数列∑
赤線部分の変換のやり方教えてください⁝( ;ᾥ; )⁝
3
- Σ(-1² +1+9)
i=-1
5
• Σ{-(i-2)² + (i-2) +9}
i=1
5
= Σ(-i² +5i+3)
i=1
=-1-5-6-11+5-12-5-6+3-5
+5・
= 35
·5·6+3.5
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