题目内容
计算(x+y-z)2
答案:
解析:
解析:
| (x+y-z)2
=[(x+y)-z]2 =(x+y)2-2(x+y)·z+z2 =x2+y2+z2+2xy-2zx-2yz.
|
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题目内容
计算(x+y-z)2
| (x+y-z)2
=[(x+y)-z]2 =(x+y)2-2(x+y)·z+z2 =x2+y2+z2+2xy-2zx-2yz.
|