(xy+1)(xy-1)(x²y²+1)-(xy-1)²+8x的六次方y的三次方/2x的四次方y

问题描述:

(xy+1)(xy-1)(x²y²+1)-(xy-1)²+8x的六次方y的三次方/2x的四次方y
越快越好

原式=(x²y²-1)(x²y²+1)-(x²y²-2xy+1)+4x²y²
=x^4y^4-1-x²y²+2xy-1+4x²y²
=x^4y^4+3x²y²+2xy-4