1、原式=(x+1/3)(3x+1)
2、原式=[3(a+b)]^2+2*3(a+b)*5(a-b)+[5(a-b)]^2=[3(a+b)+5(a-b)]^2=[3a+3b+5a-5b]^2=(8a-2b)^2=4(4a-b)^2
3、原式=[x(x-2)^2+2x(x-2)+1=[x(x-2)+1]^2=[x^2-2x+1]^2=(x-1)^4
4、+x(mn+2)^2这是什么意思
5、原式=(3a-2)[(a-b)^2-a^2]=(3a-2)[a^2-2ab+b^2-a^2]=(3a-2)(b^2-2ab)=(3a-2)b(b-2a)=b(3a-2)(b-2a)