分解因式1、9/4x^2y^2-25/91m^2~2、y^2-4x^4~3、1/9+4x+36x^2~4、4x^2-2xy+y^2~5、x^2-6x(x+y)+9(x+y)
问题描述:
分解因式1、9/4x^2y^2-25/91m^2~2、y^2-4x^4~3、1/9+4x+36x^2~4、4x^2-2xy+y^2~5、x^2-6x(x+y)+9(x+y)
答
1、9/4x^2y^2-25/91m^2(91应该是81吧?)=(3/2xy)²-(5/9m)²=(3/2xy+5/9m)(3/2xy-5/9m)2、y^2-4x^4=(y+2x²)(y-2x²)3、1/9+4x+36x^2=(6x+1/3)²4、4x^2-2xy+y^2题目错了5、x^2-6x(...