求初中因式分解的练习题

1。3x^6-3x^2=3x^2（x^4-1)=3x^2(x^2+1)(x^2-1)=3x^2(x^2+1)(x+1)(x-1) 2。(a^2-2b)^2-(1-2b)^2=(a^2-2b+1-2b)( a^2-2b-1+2b)=(a^2+1)(a^2-1）=（a^2+1)(a+1)(a-1)3。9x^4-36y^2=9(x^4-4y^2)=9(x^2+2y)(x^-2y) 4。4(x+y)^2-(x-y)^2=^2-(x-y)^2(2x+2y+x-y)(2x+2y-x+y)=(3x+y)(x+3y) 5。x^2-3=(x+根号3)(x-根号3) 6。x^2-5y^2=(x+根号5