设A={4,5,6,8}、B={3、5、7、8},求A∪B
设A={4,5,6,8}、B={3、5、7、8},求A∪B
设A={3,5,6,8} B={4,5,7,8} 求AUB,A∩B
设A={3,5,6,8},B={4,5,7,8},求AnB,AUB
设全集U={1,2,3,4,5,6,7,8},集合A={2,4,6},集合B={3,4,5},求A∩B,A∪B,A在U中
设U={1,2,3,4,5,6,7,8},A={2,4,6},B={3,4,5},求A集合B,A∪B,CuA,CuB
设集合U={不大于10的自然数},A={1,3,5,7},B={2,4,6,8}试求A∪B,A∩B,(CA)并(CB)
设A=4a的平方+5b,B=-3a的平方+2b,求A-3B,其中a=-1,b=2.
设集合A={x|2≤x<4},B={x|3x-7≥8-2x},求A∪B,A∩B.
定义新运算设a*b=a*a+2b,那么求10*6和5*(2*8)
{A+2B-3C=4,5A-6B+7C=8}求代数式A:B:C 2A-3C/A+2B
a+b+3(-a-b+1)=4(1-b-a)-5(b-1+a)求代数式7(a+b-3)/8-1的值
设A={x|x是小于9的正整数},B={1,2,3}+C={3,4,5,6},求A∩B,A∩C,A∩(B∪C),A∪(B