(要写过程哦!)
1. 2x+6y-x^+9y^
2. 4x^-y^-4x+2y
3. x^-a^-2x-2a
4. ax^-x-y-ay^
5. x^-2xy+y^-1
6. x^-y^-ayz-4z^
7. 4a^-4n^+b^-m^+4(ab+mn)
(要写过程哦!)
1. 2x+6y-x^+9y^
2. 4x^-y^-4x+2y
3. x^-a^-2x-2a
4. ax^-x-y-ay^
5. x^-2xy+y^-1
6. x^-y^-ayz-4z^
7. 4a^-4n^+b^-m^+4(ab+mn)
1题原式=(3y)²+6y+1-x²+2x-1
=3y)²+6y+1-(x²-2x+1)
=(3y+1)²-(x-1)²
=(3y+x)(3y-x+2)
2题原式=(4x²-4x+1)—(y²-2y+1)
=(2x-1)²-(y-1)²
=(2x+y-2)(2x-y)
3题 原式=(x²-2x+1)-(a²+2a+1)
=(x-1)²-(a+1)²
=(x+a)(x-a-2)
4题原式=(ax²-ay²)-(x+y)
=a(x²-y²)-(x+y)
=a(x+y)(x-y)-(x+y)
=(x+y)(ax-ay-1)