Mathematica "与","或"的表示哪里错了?"与","或"的表示哪里错了?输入:FindInstance[3 x1 + 5 x2 + 7 x3 == 0 && x1 + x2 + x3 == 1 ||x1 + x2 + x3 == 3 && x1 = 0 && x2 = 0 && x3 = 0 && x1 = 1 &&x2 = 1 && x3 = 1,{x1,x2,x3},Integers]输出:{
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