问题
计算题
因式分解:
(1)2xy2﹣4y2z;
(2)x3+4x2+4x;
(3)1﹣4x2;
(4)x3﹣25x.
答案
解:(1)2xy2﹣4y2z=2y2(x﹣2z);
(2)x3+4x2+4x,=x(x2+4x+4),=x(x+2)2;
(3)1﹣4x2=(1+2x)(1﹣2x);
(4)x3﹣25x,
=x(x2﹣25),
=x(x+5)(x﹣5).
因式分解:
(1)2xy2﹣4y2z;
(2)x3+4x2+4x;
(3)1﹣4x2;
(4)x3﹣25x.
解:(1)2xy2﹣4y2z=2y2(x﹣2z);
(2)x3+4x2+4x,=x(x2+4x+4),=x(x+2)2;
(3)1﹣4x2=(1+2x)(1﹣2x);
(4)x3﹣25x,
=x(x2﹣25),
=x(x+5)(x﹣5).