题目内容
(x-2y+z)2=______.
(x-2y+z)2
=[(x-2y)+z]2
=(x-2y)2+2(x-2y)z+z2
=x2-4xy+4y2+2xz-4yz+z2.
故答案为:x2-4xy+4y2+2xz-4yz+z2.
=[(x-2y)+z]2
=(x-2y)2+2(x-2y)z+z2
=x2-4xy+4y2+2xz-4yz+z2.
故答案为:x2-4xy+4y2+2xz-4yz+z2.
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