问题
解答题
把下列多项式因式分①2mx-4my ②a2-9b2 ③x2+2xy+y2 ④mx2-4my2
答案
①2mx-4my=2m(x-2y);
②a2-9b2 =(a+3b)(a-3b);
③x2+2xy+y2=(x+y)2;
④mx2-4my2=m(x2-4y2)=m(x+2y)(x-2y).
把下列多项式因式分①2mx-4my ②a2-9b2 ③x2+2xy+y2 ④mx2-4my2
①2mx-4my=2m(x-2y);
②a2-9b2 =(a+3b)(a-3b);
③x2+2xy+y2=(x+y)2;
④mx2-4my2=m(x2-4y2)=m(x+2y)(x-2y).