计算:(2x-3y-4z)^2
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计算:(2x-3y-4z)^2
计算:(2x-3y-4z)^2
计算:(2x-3y-4z)^2
(2x-3y-4z)^2
=(2x-3y)^2 -8(2x-3y)z+16z^2
=4x^2 - 12xy + 9y^2 - 16xz + 24yz + 16z^2
=4x^2 + 9y^2 + 16z^2 - 12xy - 16xz + 24yz
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