4(x+y+z)的平方—9(x-y-z)的平方 等于几?

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4(x+y+z)的平方—9(x-y-z)的平方等于几?4(x+y+z)的平方—9(x-y-z)的平方等于几?4(x+y+z)的平方—9(x-y-z)的平方等于几?=[2(x+y+z)]^2-[3(x-

4(x+y+z)的平方—9(x-y-z)的平方 等于几?
4(x+y+z)的平方—9(x-y-z)的平方 等于几?

4(x+y+z)的平方—9(x-y-z)的平方 等于几?
=[2(x+y+z)]^2-[3(x-y-z)]^2
=[2(x+y+z)+3(x-y-z)]*[2(x+y+z)-3(x-y-z)]
=(5x-y-z)(5y+5z-x)