设U={2,-1,x2-x+1},B={2y,-4,x+4},C={-1,7},且A∩B=C,求x,y的值及A∪B
已知A={2,-1,x2-x+1},B={2y,-4,x+4},C={-1,7}且A∩B=C,求x,y的值及A∪B.
2.已知A={2,-1,X的平方-X+1},B={2y,-4,X+4},C={-1,7},且A交B=C,求X,y的值及A
设A= x 0,B= u v,C= 3 -4,若A+2B-C=0,求x,y,u,v的值
设全集U={x|x≥-2},A={x||x|≥1|,B={y|y=x2,x∈R}定义A*B={x|x∈A∪B且xW
设集合A={2,-1,x-x+1}B={2y,-4,x+4},且A交B={-1,7}求x,y的值.
1.设集合A={x|-2≤x≤a},B={y|y=2x+3,x∈A},C={y=x2 ,x∈A},若B∪C=B,求a的取
已知x/x+y=a,x/x+y=c,且abc不等于0,求a/(a+1)+b/(b+1)+c/(c+1)的值
设集合A={2,-1,x²-x+1},B={2y,-4,x+4},C={-1,7} 且A∩B=C 求实数x,y
已知a^x-y*a^2y+1=a^11,且b^x-1*b^4-y=b^5,求(x^2)*y的值
设非空集合A={x|-2≤x≤a},B={y|y=2x+3,x∈A},C={z|z=x2,x∈A},且B∩C=C,求实数
设集合A={x,x2,y2-1},B={0,|x|,y}且A=B,求x,y的值.
设集合A={x│3≤x≤8},B{y│y=1/2x+4,x∈A},C={x│(x-4)/2∈Z},求C∩B