(2)訂正
(x－y)＾2＋3y＾2
＝(√5＋3－√5＋3)＾2＋3(√5－3)＾2
＝36＋3(5＋9－6√5)
＝36＋42－18√5
＝78－18√5
Answers
(2)
(x－2y)＾2に代入して
＝(√5＋3－2√5＋6)＾2
＝(9－√5)＾2
＝86－18√5
(3)
(y－x)/xy
＝(√5－3－√5－3)/(√5＋3)(√5－3)
＝－6/(5－9)
＝6/4
＝3/2
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