Mathematics
Undergraduate
2）の解き方を教えてください！
無限級数1+z(1 ー2)+ 2°(1-x)? + が収束するとき
(1) rの値の範囲を求めよ。
(2) この無限級数の和 S の値の範囲を求めよ。
1+ V5
くEく
2
1- V5
2
2
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