求三平面x+3y+z=1,2x-y-z=0,-x+2y+2z=0的交点是
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求三平面x+3y+z=1,2x-y-z=0,-x+2y+2z=0的交点是
求三平面x+3y+z=1,2x-y-z=0,-x+2y+2z=0的交点是
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