Question

分解因式：（x+y)^2-10(x+y)+25还有(a^2+b^2)^2-4a^2b^2

Answer 1

（x+y)^2-10(x+y)+25=[(x+y)-5]^2=(x+y-5)^2

(a^2+b^2)^2-4a^2b^2=(a^2+b^2+2ab)(a^2+b^2-2ab)=(a+b)^2(a-b)^2