Mathematics
Junior High
Solved
(1)の①と(2)の①が何故こうなるのかが分かりません。教えて欲しいです🙇♀️
解説 (1)① x+y=√3+1+√3-1=2√3
2xy=(√3+1) (√3-1)=20S
③(x² + y²= (x+y)² -2xy +299
2
-=(2/3)2-2x2=12-4-8) 801
④x² + xy + y² = (x+y)²-xy-11 (2)
4
2-1+)=(2√3)2-2-12-2=10
(2) x+y=√5+√2+√5-√2=2√5
2xy=(√5+√2) (√5-√2)=3(e)
2
③x²+ y² = (x+y)²=2xy
=(2/5)2-2x3=20-6=14
4x²-xy+y²=(x+y) 2-3xy+=
= (2√5) 2-3x3=20-9=11
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