Question

（x+y）的平方+6（x+y）+9 因式分解

Answer 1

(x+y)^2+6(x+y)+9=[(x+y)+3]^2=(x+y+3)^2a^2-2a(b+c)+(b+c)^2=[a-(b+c)]^2=(a-b-c)^24-12(x-y)+9(x-y)^2=[2-3(x-y)]^2=(2-3x+3y)^21-2x^2+x^4=(1-x^2)^2=(1+x)^2(1-x)^2x^2-12xy+36y^2=(x-6y)^225p^2+10pq+q^2=(5p+q...