(x+y+z)的平方-(x-y-z)的平方
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(x+y+z)²-(x-y-z)²
=[x+(y+z)]²-[x-(y+z)]²
=[x+(y+z)+x-(y+z)] {x+(y+z)-[x-(y+z)]}
=2x*2(y+z)
=4x(y+z )
=[x+(y+z)]²-[x-(y+z)]²
=[x+(y+z)+x-(y+z)] {x+(y+z)-[x-(y+z)]}
=2x*2(y+z)
=4x(y+z )
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展开全部
(x+y+z)^2-(x-y-z)^2
=[(x+y+z)+(x-y-z)][(x+y+z)-(x-y-z)]
=2x(2y+2z)
=4x(y+z)
=[(x+y+z)+(x-y-z)][(x+y+z)-(x-y-z)]
=2x(2y+2z)
=4x(y+z)
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