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ax2+2a2x+a的三次方,等于多少,-2xy-x2-y2 等于多少,
人气:374 ℃ 时间:2020-06-11 13:00:54
解答
ax^2+2ax+a
=a(x^2+2x+1)
=a(x+1)^2
-2xy-x2-y2
=-(x^2+2xy+y^2)
=-(x+y)^2
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