计算:(x-3y-2z)*(x+3y-2z)=? 帮帮忙.
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计算:(x-3y-2z)*(x+3y-2z)=? 帮帮忙.
计算:(x-3y-2z)*(x+3y-2z)=? 帮帮忙.
计算:(x-3y-2z)*(x+3y-2z)=? 帮帮忙.
原式=[(x-2z)-3y]*[(x-2z)+3y]
=(x-2z)^2-(3y)^2
=x^2-4xz+4z^2-9y^2
把括号里的变量换下位置,将x-2z就可以看成一体,这样就可以利用定理求解了.
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