问题
解答题
把下列各式分解因式:
①3ax2-3ay2
②m3+4m2+4m
③(x2+y2)2-4x2y2.
答案
①3ax2-3ay2
=3a(x2-y2)
=3a(x+y)(x-y);
②m3+4m2+4m
=m(m2+4m+4)
=m(m+2)2,
③(x2+y2)2-4x2y2
=(x2+y2+2xy)(x2+y2-2xy)
=(x+y)2(x-y)2.
把下列各式分解因式:
①3ax2-3ay2
②m3+4m2+4m
③(x2+y2)2-4x2y2.
①3ax2-3ay2
=3a(x2-y2)
=3a(x+y)(x-y);
②m3+4m2+4m
=m(m2+4m+4)
=m(m+2)2,
③(x2+y2)2-4x2y2
=(x2+y2+2xy)(x2+y2-2xy)
=(x+y)2(x-y)2.