(x+0.5y)(x-0.5y)(x²--0.25y²)
问题描述:
(x+0.5y)(x-0.5y)(x²--0.25y²)
答
(x+0.5y)(x-0.5y)(x²--0.25y²)
=(x²-0.25y²)(x²-0.25y²)
=(x²-0.25y²)^2