分解因式:(1)25x²-36 (2)am+bm-cm (3)64-16a+a² (4)2(x-y)+a(x-y)
问题描述:
分解因式:(1)25x²-36 (2)am+bm-cm (3)64-16a+a² (4)2(x-y)+a(x-y)
答
25x²-36
=(5x)^2-6^2
=(5x+6)(5x-6)
am+bm-cm
=m(a+b-c)
64-16a+a²
=8^2-2*8*a+a^2
=(8-a)^2
2(x-y)+a(x-y)
=(x-y)(2+a)