（x+y-z）*（x+y-z)-(x-y+z)*(x-y-z)等于多少
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（x+y-z）*（x+y-z)-(x-y+z)*(x-y-z)等于多少（x+y-z）*（x+y-z)-(x-y+z)*(x-y-z)等于多少（x+y-z）*（x+y-z)-(x-y+z)*(x-y-z
（x+y-z）*（x+y-z)-(x-y+z)*(x-y-z)等于多少
（x+y-z）*（x+y-z)-(x-y+z)*(x-y-z)等于多少
（x+y-z）*（x+y-z)-(x-y+z)*(x-y-z)等于多少
你好
（x+y-z）*（x+y-z)-(x-y+z)*(x-y-z)
=[（x+y）-z]*[（x+y）-z]-[(x-y）+z]*[(x-y）-z)]
=[（x+y）²-z²]-[（x-y）²-z²]
=（x+y）²-（x-y）²
=4xy
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（x+y-z）*（x+y-z)-(x-y+z)*(x-y-z)
=(x+y)²-2(x+y)z+z²-[(x-y)²-z²]
=x²+2xy+y²-2xz-2yz+z²-x²+2xy-y²+z²
=4xy-2xz-2yz+2z²
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（x+y-z）*（x+y-z)-(x-y+z)*(x-y-z)
=（x＋y）²-2（x＋y）z＋z²-【（x-y）²-z²】
=x²＋2xy＋y²-2xz-2yz＋z²-x²＋2xy-y²＋z²
=4xy-2xz-2yz＋2z²
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