分类：教育/科学-学习帮助
问题：7.因式分解5x(x
5x(x-y)+2y(x-y)

2a(a-b)-4b(b-a)

-8a(a-2b)^3+2a^3(2b-a)2


10a(y-x)+5b(y-x)


4x^2+4xy+y^2



9x^2+6xy+y^2



25x^4-10^2+1



9a^4-81b2



36X^2-84xy+49y^2


x^2+8xy+16y^2
回答：5x(x-y)+2y(x-y)=(x-y)(5x+2y)

2a(a-b)-4b(b-a)=2(a-b)(a+2b)
-8a(a-2b)^3+2a^3(2b-a)2=-2a(a-2b)^2(4a-8b+a^2)


10a(y-x)+5b(y-x)=5(y-x)(2a+b)


4x^2+4xy+y^2=(2x+y)^2



9x^2+6xy+y^2=(3x+y)^2



25x^4-10^2+1=(5x-1)^2



9a^4-81b2=9(a^2+3b)(a^2-3b)



36X^2-84xy+49y^2=(6x-7y)^2


x^2+8xy+16y^2 =(x+4y)^2