Mathematics
Senior High
Resolved
丸つけてるところなんですけど、なんで引く必要があるのですか?
√5+√3
-のとき, x+y, xy, x2+y', x3+y', x-y3 の値を
(S)
de
30
[類 順天堂大 ]
as x
練習
√5+√3
② 28
x=
√5-√3
√√5-√3
y=
=
求めよ。
xy=
√5-√3 √5+√√3
=1+$
S
x²+ y²= (x+y)² -2xy=82-2.1=62
x³+y³=(x+y)³-3xy(x+y)=83-3.1.8
また
x-y=
√√5+√3 √5-√3
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