(x2-y2)-4(2x2-3y)
问题描述:
(x2-y2)-4(2x2-3y)
答
=x²-y²-8x²+12y
=-7x²-y²+12y
(x2-y2)-4(2x2-3y)
=x²-y²-8x²+12y
=-7x²-y²+12y