题目内容
(请给出正确答案)
[主观题]
若关系X、Y、Z如图所示,求: 1.∏A,C(X) 2.σB <'B2' (X) 3. X│╳│ Y 4.X ÷ Z X Y Z A B C C D B C A1 A1 A2 A3 A3 A4 A1 B1 B2 B3 B1 B2 B1 B1 C1 C4 C1 C2 C4 C2 C2 C1 C2 C3 D1 D2 D3 B1 B2 B1 C2 C4 C1
答案
2
![](https://lstatic.shangxueba.com/sxbcn/h5/images/tips_org.png)
第5题
A.Cos[xyz](yzDt[x]+xzDt[y]+xyDt[z])
B.Cos[xyz](yz+xz+xy)
C.Cos[xyz](yzD[x]+xzD[y]+xyD[z])
D.Cos[xyz](yzDt[x,x]+xzDt[y,x]+xyDt[z,x])
第9题
A.w'z' + w'xy + wx'z + wxyz = w'z' + xyz + wx'y'z + wyz
B.z + y' + yz' = 1
C.xy'z' + x' + xyz' = x' + zy'
D.xy + x'z + yz = xy + x'z
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