Mathematics
Senior High
Resolved
2が出てきて4が中に入る理由がわかりません。
(2)9±4√5=√9±2√5・4
=√(5+4) ±2√5.4
=√5±√4=√5±2 (複号同順)
よって, √9-4√5-√9+4√5
=(√5-2)-(√5+2ー
(21
15.4は計算しない
演習問題 1
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