鑻2+xy=2,y虏+xy=3锛屽垯x虏+2xy+y虏=
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鑻2+xy=2,y虏+xy=3锛屽垯x虏+2xy+y虏=鑻2+xy=2,y虏+xy=3锛屽垯x虏+2xy+y虏=鑻2+xy=2,y虏+xy=3锛屽垯x虏
鑻2+xy=2,y虏+xy=3锛屽垯x虏+2xy+y虏=
鑻2+xy=2,y虏+xy=3锛屽垯x虏+2xy+y虏=
鑻2+xy=2,y虏+xy=3锛屽垯x虏+2xy+y虏=
x²+2xy+y²
=x²+xy+xy+y²
=(x²+xy)+(xy+y²)
=2+3
=5