来自孙庆有的问题
【当x=1984,y=1916时,计算x4−y4x2−2xy+y2•y−xx2+y2=______.】
当x=1984,y=1916时,计算x4−y4x2−2xy+y2•y−xx2+y2=______.
1回答
2020-03-1921:32
【当x=1984,y=1916时,计算x4−y4x2−2xy+y2•y−xx2+y2=______.】
当x=1984,y=1916时,计算x4−y4x2−2xy+y2•y−xx2+y2=______.
原式=-(x+y)(x−y)(x