由a={(x,y,z)|2x y z=4},b={(x,y,z)|3x-y-z=1},C={(x,y,z)|x-2y +6z=5}得 联立方程得求出xyz的值就行了
已知集合a={(x,y,z)|2x y z=4},b={(x,y,z)|3x-y-z=1},C={(x,y,z)|x-2
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