因式分解,练习题因式分解下列各式:(1) 30-11x-30x^2 (2) 2(3x+1)^2-3(3x+1)(y-2)+(y-2)^2
问题描述:
因式分解,练习题
因式分解下列各式:
(1) 30-11x-30x^2
(2) 2(3x+1)^2-3(3x+1)(y-2)+(y-2)^2
答
(5x+6)(-6x+5)
答
30-11x-30x^2
=-(30x²+11x-30)
=-(5x+6)(6x-5)
2(3x+1)^2-3(3x+1)(y-2)+(y-2)^2
=[2(3x+1)-(y-2)][(3x+1)-(y-2)]
=(6x-y+4)(3x-y+3)