求解(x+2y+3z)*(x+2y-3z)要步骤
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2x+3y+z=11,x+y+z=6,3x-y-z=-2求解
2x+3y+z=11,3x+y-z=2,x+y+z=6求解
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求解(x+2y+3z)*(x+2y-3z)要步骤
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化简-(-3x-y+2z)-{-x+【4x-(x-y-z)-3x+2z}