因式分解5道题,越多越好,随便回答几道
问题描述：
因式分解5道题,越多越好,随便回答几道
1) ( 2x^n-1 ) - ( 4x^2n-2 )
2) x(x-y)(3x+y) - 2x(x+y)(x-y)
3) 3 (a + b ) ^2 - 27c^2
4) (5m^2 +3n^2)^2 - (3m^2 + 5n^2)^2
5) x^4 - 18x^2 +81
做好后想确定一下,回答的越多越好,
答
1) ( 2x^n-1 ) - ( 4x^2n-2 )=2X^n-1(1-X^n-1)2) x(x-y)(3x+y) - 2x(x+y)(x-y)=X(X-Y)[3X+y-2x-2y]=X(X-Y)(x-y)3) 3 (a + b ) ^2 - 27c^2=3[(a+b)^2-9c^2]=3(a+b+3c)(a+b-3c)4) (5m^2 +3n^2)^2 - (3m^2 + 5n^2)^2=[5...