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1.二、B A B B AB B B B A、B B B AB、B B B B
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2.4 b different b b types b b of b b computers b with b their b functions
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3.A={{a,{b}},c,{c},{a,b}},B={{a,b},c,{b}}求 AÈB,AÇB,A-B,AÅB
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4.estas son las b diferencias b b entre b el b agua b b carbonatada b b y b b agua b
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5.a b>0,bA、a b -a –bB、a -a b -bC、a -b b -aD、-a -b a b
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6.b b b
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7.设a,b满足A、a a <a bB、b a <b bC、aa<b aD、b b <a b
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8.A(a>(b)>(cA、(c)>(b)>(B、(b)>(a>(c)C、(a)>(c>(b
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9.设A={a,b,{a,b},c},B={b,{b,c},{a}},求A-B,B-A,A B.设A={a,b,{a,b},c},B={b,{b,c},{a}},求A-B,B-A,A B.
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10.( A∩B)∪B = ( )