计算（x+y-z)(x-y-z)
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计算（x+y-z)(x-y-z)计算（x+y-z)(x-y-z)计算（x+y-z)(x-y-z)（x+y-z)(x-y-z)=[(x-z)+y][(x-z)-y]=(x-z)²-y²
计算（x+y-z)(x-y-z)
计算（x+y-z)(x-y-z)
计算（x+y-z)(x-y-z)
（x+y-z)(x-y-z)
=[(x-z)+y][(x-z)-y]
=(x-z)²-y²
=x²-2xz+z²-y²
将(y-z)看成a 则=(x+a)(x-a)=x^2-a^2=x^2-(y-z)^2 下面(y-z)^2应该会了吧
(x-z)2-y2
=X平方-(Y-Z)平方
=X平方-(Y平方-2YZ+Z平方)
=X平方-Y平方-Z平方+2YZ
计算（x+y-z)(x-y-z)
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