问题
解答题
分解因式:
(1)16a2-9b2;
(2)5x2y2-125z2;
(3)(m+n)y2-m-n.
答案
(1)16a2-9b2=(4a+3b)(4a-3b);
(2)5x2y2-125z2
=5(x2y2-25z2)
=5(xy+5z)(xy-5z);
(3)(m+n)y2-m-n
=(m+n)(y2-1)
=(m+n)(y+1)(y-1).
分解因式:
(1)16a2-9b2;
(2)5x2y2-125z2;
(3)(m+n)y2-m-n.
(1)16a2-9b2=(4a+3b)(4a-3b);
(2)5x2y2-125z2
=5(x2y2-25z2)
=5(xy+5z)(xy-5z);
(3)(m+n)y2-m-n
=(m+n)(y2-1)
=(m+n)(y+1)(y-1).