ab^4-4a
=a(b^4-4)
=a(b^2-2)(b^2+2)
ab^4-4a
=a(b^2-2)(b^2+2)
=a(b-sqrt(2))(b+sqrt(2))(b^2+2)
在有理数范围内分解因式ab^4-4a,在实数范围内分解因式ab^4-4a
ab^4-4a
=a(b^4-4)
=a(b^2-2)(b^2+2)
ab^4-4a
=a(b^2-2)(b^2+2)
=a(b-sqrt(2))(b+sqrt(2))(b^2+2)