计算:(3x+2y-z)(-3x+2y-z)
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计算:(3x+2y-z)(-3x+2y-z)
计算:(3x+2y-z)(-3x+2y-z)
计算:(3x+2y-z)(-3x+2y-z)
(3x+2y-z)(-3x+2y-z) :
[(2y-z)+ 3x] [(2y-z)- 3x] =(2y-z)^2 -9x^2
4y²-4yz z²-9x²
2y-z看成整体。就是个(b+a)(-b+a)嘛
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