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x的相反數是3,y的絕對值是4,z與3的和是0. 所以 x=-3, y=4或-4 z=-3 從而 1.xy+YZ+XZ=-3*4+4*(-3)+(-3)*(-3)=-24+9=-15 2.xy+YZ+XZ=-3*(-4)+(-4)*(-3)+(-3)*(-3)=24+9=33
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