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1,(x^2)-2x-9(y^2)+6y2,(x^2)-(y^2)-1-2y
题目详情
1,
(x^2)-2x-9(y^2)+6y
2,
(x^2)-(y^2)-1-2y
(x^2)-2x-9(y^2)+6y
2,
(x^2)-(y^2)-1-2y
▼优质解答
答案和解析
1,
(x^2)-2x-9(y^2)+6y
=(x^2-2x+1)-(9y^2-6y+1)
=(x-1)^2-(3y-1)^2
=(x-3y)(x+3y-2)
2,
(x^2)-(y^2)-1-2y
=x^2-(y^2+2y+1)
=x^2-(y+1)^2
=(x+y+1)(x-y-1)
(x^2)-2x-9(y^2)+6y
=(x^2-2x+1)-(9y^2-6y+1)
=(x-1)^2-(3y-1)^2
=(x-3y)(x+3y-2)
2,
(x^2)-(y^2)-1-2y
=x^2-(y^2+2y+1)
=x^2-(y+1)^2
=(x+y+1)(x-y-1)
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