1/2(x+y+z)的平方+1/2(x-y-z)(x-y+z)-z(x+y)化简为多少?
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![1/2(x+y+z)的平方+1/2(x-y-z)(x-y+z)-z(x+y)化简为多少?](/uploads/image/z/7611186-66-6.jpg?t=1%2F2%28x%2By%2Bz%29%E7%9A%84%E5%B9%B3%E6%96%B9%2B1%2F2%28x-y-z%29%28x-y%2Bz%29-z%28x%2By%29%E5%8C%96%E7%AE%80%E4%B8%BA%E5%A4%9A%E5%B0%91%3F)
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1/2(x+y+z)的平方+1/2(x-y-z)(x-y+z)-z(x+y)化简为多少?
1/2(x+y+z)的平方+1/2(x-y-z)(x-y+z)-z(x+y)化简为多少?
1/2(x+y+z)的平方+1/2(x-y-z)(x-y+z)-z(x+y)化简为多少?
1/2(x+y+z)的平方+1/2(x-y-z)(x-y+z)-z(x+y)
=½(x²+y²+z²+2xy+2xz+2yz)+½(x²-2xy+y²-z²)-zx-zy
=½x²+½y²+½z²+xy+xz+yz+½x²-xy+½y²-½z²-zx-zy
=x²+y²
我也不知到!!!