(X+Y+Z)(X+Y+Z)怎么去括号
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(X+Y+Z)(X+Y+Z)怎么去括号
(X+Y+Z)(X+Y+Z)怎么去括号
(X+Y+Z)(X+Y+Z)怎么去括号
(X+Y+Z)(X+Y+Z)
=X²+XY+XZ+XY+Y²+YZ+XZ+YZ+Z²
=X²+Y²+Z²+2XY+2XZ+2YZ
(X+Y+Z)(X+Y+Z)=2X+2Y+2Z
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