把下列各项式分解因式:1:8a^3b^2-12ab^3c 2:3a^2-6a+3 3:x^3(x-y)+(y-x)
问题描述:
把下列各项式分解因式:1:8a^3b^2-12ab^3c 2:3a^2-6a+3 3:x^3(x-y)+(y-x)
^ 的意为多少次方(如3^3的意为3的3次方)
答
1:8a^3b^2-12ab^3c
=4ab^2(2a^2-3bc)
2:3a^2-6a+3
=3(a^2-2a+1)
=3(a-1)^2
3:x^3(x-y)+(y-x)
=x^3(x-y)-(x-y)
=(x-y)(x^3-1)
=(x-y)(x-1)(x^2+x+1)