计算题:(x^2+y)(x^2-y)-(-x)^2×(-x^2)

问题描述:

计算题:(x^2+y)(x^2-y)-(-x)^2×(-x^2)

(x^2+y)(x^2-y)-(-x)^2×(-x^2)
=x^4-y^2-x^2×(-x^2)
=x^4-y^2+x^4
=2x^4-y^2