多项式:x^4-y^4,x^4+2x^2y^2+y^4,x^3y+xy^3的公因式是( )填空:(-3+0.2b^2)(-3-0.2b^2)=( )分解因式:(x+y)^2-z^2=( )分解因式:4x^2+4分之1-2x-9y^2=( )若x-y=0,则代数式x^3+x^2y-xy^2-y^3的值是( )已知x-y=2,xy=8,则x^2+y^2=( )
问题描述：
多项式:x^4-y^4,x^4+2x^2y^2+y^4,x^3y+xy^3的公因式是( )
填空:
(-3+0.2b^2)(-3-0.2b^2)=( )
分解因式:(x+y)^2-z^2=( )
分解因式:4x^2+4分之1-2x-9y^2=( )
若x-y=0,则代数式x^3+x^2y-xy^2-y^3的值是( )
已知x-y=2,xy=8,则x^2+y^2=( )
答
多项式:x^4-y^4,x^4+2x^2y^2+y^4,x^3y+xy^3的公因式是(x^2+y^2)x^4-y^4=(x^2+y^2)(x+y)(x-y)x^4+2x^2y^2+y^4=(x^2+y^2)^2x^3y+xy^3=xy(x^2+y^2)填空: (-3+0.2b^2)(-3-0.2b^2)=(9-0.04b^2) 分解因式:(x+y)^2-z^2=(x+y...