Mathematics
Junior High
この-2xyはどこから出てきたのですか？
(3) x²+5xy+y² = (x²+y²)+5xy
= (x+y)-2xy 5xy=(x+y)²+3xy
=(√5-√3+√5+√3)² +3 (√√5-√√3)(√5+√3)
= (2√5)²+3×(5-3)=20+6=26
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