要求:用十字相乘法分解下列因式
(1)X*2-(a+b)xy+aby*2
(2) xy-1+x-y
要求:用十字相乘法分解下列因式
(1)X*2-(a+b)xy+aby*2
(2) xy-1+x-y
(1)(x+ay)(x+by)=0
(1)(x-ay)(x-by)=0
(2)(x-1)(1+y)
(1)X*2-(a+b)xy+aby*2 *是乘方的意思吗 我用"^"代替
x^2-(a+b)xy+aby^2
=(x-ay)(x-by)
(2) xy-1+x-y
=(xy+x)-(y+1)
=x(y+1)-(y+1)
=(y+1)(x-1)
(2)x(y+1)-(1+y)
=(x-1)(1+y)