2个回答
展开全部
3x²-4xy-2y²
=5x²-2(x²+2xy+y²)
=5x²-2(x+y)²
=(√5x)²-[√2(x+y)]²
=[√5x+√2(x+y)][√5x-√2(x+y)]
=[(√5+√2)x+√2y][(√5-√2)x-√2y]
2a²-3ab-b²
=2[a²-2×a×3b/4+(3b/4)²-17b²/16]
=2[(a-3b/4)²-(√17b/4)²]
=2[a-(3-√17)b/4][a-(3+√17)b/4]
=5x²-2(x²+2xy+y²)
=5x²-2(x+y)²
=(√5x)²-[√2(x+y)]²
=[√5x+√2(x+y)][√5x-√2(x+y)]
=[(√5+√2)x+√2y][(√5-√2)x-√2y]
2a²-3ab-b²
=2[a²-2×a×3b/4+(3b/4)²-17b²/16]
=2[(a-3b/4)²-(√17b/4)²]
=2[a-(3-√17)b/4][a-(3+√17)b/4]
本回答由提问者推荐
已赞过
已踩过<
评论
收起
你对这个回答的评价是？
推荐律师服务：
若未解决您的问题，请您详细描述您的问题，通过百度律临进行免费专业咨询
