ax2+2a2x+a的三次方,等于多少,-2xy-x2-y2 等于多少,

问题描述:

ax2+2a2x+a的三次方,等于多少,-2xy-x2-y2 等于多少,

ax^2+2ax+a
=a(x^2+2x+1)
=a(x+1)^2
-2xy-x2-y2
=-(x^2+2xy+y^2)
=-(x+y)^2