Question

因式分解、急~~~

1. -4(a-b)²+6(a+b)(a-b)
2. 12a(x²+y²)-18b(x²+y²)
3. (2x+y)(2y-3y)+x(2x+y)
4. 4(3a-b)²-(2a+3b)²
5. x³-6x²+9x
6. 9(x-y)²+12(x-y)+4

Answer 1

1.-2(a-b)[2(a-b)+3(a+b)]=-2(a-b)(5a-b);
2.(12a-18b)(x²+y²)
3.(2x-y)(2y-3y+x)=(2x-y)(x-y)
4. 4(3a-b)²-(2a+3b)²
5.x(x²-6x+9)=x(x-3)(x-3)
6.3(x-y)(3x-3y+4)+4

追问

谢谢