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Giả sử cho A1 = {1,2,3,4}, A2 = {1,2,7,12}, A3={0,1,2,4,8,16,32} và A4 = {-3,-2,-1,0,1,2,3} xét R1 = { (x,y,z,t) thuộc A1*A2*A3*A4; xyzt=0} hãy tính R1
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35 votes
35 votes
Giả sử cho A1 = {1,2,3,4}, A2 = {1,2,7,12}, A3={0,1,2,4,8,16,32} và A4 = {-3,-2,-1,0,1,2,3}

xét R1 = { (x,y,z,t) thuộc A1*A2*A3*A4; xyzt=0} hãy tính R1

User Yiati
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1 Answer

19 votes
19 votes

Explanation:

R2 A1 A2 A3 A4 A5 R3 A1 A2A6

User Dan Parsonson
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