问题
计算题
分解因式:
(1)m2+4m+4
(2)a2b﹣4ab2+3b3
(3)(x2+y2)2﹣4x2y2.
答案
解:(1)m2+4m+4=(m+2)2;
(2)a2b﹣4ab2+3b3=b(a2﹣4ab+3b2)=b(a﹣b)(a﹣3b);
(3)(x2+y2)2﹣4x2y2.
=(x2+y2+2xy)(x2+y2﹣2xy)
=(x+y)2(x﹣y)2.
分解因式:
(1)m2+4m+4
(2)a2b﹣4ab2+3b3
(3)(x2+y2)2﹣4x2y2.
解:(1)m2+4m+4=(m+2)2;
(2)a2b﹣4ab2+3b3=b(a2﹣4ab+3b2)=b(a﹣b)(a﹣3b);
(3)(x2+y2)2﹣4x2y2.
=(x2+y2+2xy)(x2+y2﹣2xy)
=(x+y)2(x﹣y)2.