Mathematics
Senior High

式を簡単にする問題です。1行目⇒2行目で、右の式の-がなくなっていますが、くくりだしたら前に-つけるのではないのですか?

(2/5-3/√2)(-2/√5-3√2) 2
2 (2) (2√5-3√2) (-2√√5-3√2) 2 3= = = 2 (2√5-3√2) (2√5+3√2) 2 {(2/5-3√2)(2/5 22 +3√2)}2 = {(2√5)² - (3√2)²}² (20-18)2=47-25 =

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