计算题:(x^2+y)(x^2-y)-(-x)^2×(-x^2)
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计算题:(x^2+y)(x^2-y)-(-x)^2×(-x^2)计算题:(x^2+y)(x^2-y)-(-x)^2×(-x^2)计算题:(x^2+y)(x^2-y)-(-x)^2×(-x^2)(x^2
计算题:(x^2+y)(x^2-y)-(-x)^2×(-x^2)
计算题:(x^2+y)(x^2-y)-(-x)^2×(-x^2)
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
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