Question

计算 （X＋Y＋Z）的平方

Answer 1

(x+y+z)²
=[(x+y)+z]²
=(x+y)²+2(x+y)z+z²
=x²+2xy+y²+2xz+2yz+z²
=x²+y²+z²+2xy+2xz+2yz

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Answer 2

(x+y+z)²
=(x+y+z)(x+y+z)
=x²+xy+xz+yx+y²+yz+zx+zy+z²
=x²+y²+z²+2(xy+yz+zx)
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望采纳，多谢了！

Answer 3

(x+y+z)²=x²+y²+z²+2xy+2yz+2xz

Answer 4

x方+y方+z方+2{xy+YZ+XZ}