(x+y-z)乘以(x-y-z)等于?
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(x+y-z)乘以(x-y-z)等于?(x+y-z)乘以(x-y-z)等于?(x+y-z)乘以(x-y-z)等于?(x+y-z)(x-y-z)=[(x-z)+y][(x-z)-y]=(x-z)
(x+y-z)乘以(x-y-z)等于?
(x+y-z)乘以(x-y-z)等于?
(x+y-z)乘以(x-y-z)等于?
(x+y-z)(x-y-z)
=[(x-z)+y][(x-z)-y]
=(x-z)²-y²
=x²-2xz+z²-y²
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