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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