因式分解下列各式: 1.4x²-4y²+x-y 2.9x²-9y²-2x-2y?
回答 (2)
2015-10-28 1:40 pm
✔ 最佳答案
1.4x^2-4y^2+x-y
=4(x^2-y^2)+(x-y)
=4(x+y)(x-y)+(x-y)
=(x-y)(3x-3y)
=3(x-y)(x-y)
2.
9x^2-9y^2-2x-2y
=9(x^2-y^2)-2(x+y)
=9(x-y)(x+y)-2(x+y)
=(x+y)(9x+9y-2)2
2015-10-28 1:48 pm
1. 4x²-4y²+x-y
=4(x²-y²)+(x-y)
=4(x-y)(x+y)+(x-y)
=(x-y)(4x+4y+1)
2. 9x²-9y²-2x-2y
=9(x²-y²)-2(x+y)
=9(x-y)(x+y)-2(x+y)
=(x+y)(9x-9y-2)
=4(x²-y²)+(x-y)
=4(x-y)(x+y)+(x-y)
=(x-y)(4x+4y+1)
2. 9x²-9y²-2x-2y
=9(x²-y²)-2(x+y)
=9(x-y)(x+y)-2(x+y)
=(x+y)(9x-9y-2)
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