1.设A={2,-1.x²-x+1}B={2y,-4,x+4}C={-1,7}且 A∩B=C 求x y的值2.设A={a²,a+1,-3} B={a-3,2a-1,a²+1} A∩B={-3}求a的值要有过程啊
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1.设A={2,-1.x²-x+1}B={2y,-4,x+4}C={-1,7}且 A∩B=C 求x y的值2.设A={a²,a+1,-3} B={a-3,2a-1,a²+1} A∩B={-3}求a的值要有过程啊
1.设A={2,-1.x²-x+1}B={2y,-4,x+4}C={-1,7}且 A∩B=C 求x y的值
2.设A={a²,a+1,-3} B={a-3,2a-1,a²+1} A∩B={-3}求a的值
要有过程啊
1.设A={2,-1.x²-x+1}B={2y,-4,x+4}C={-1,7}且 A∩B=C 求x y的值2.设A={a²,a+1,-3} B={a-3,2a-1,a²+1} A∩B={-3}求a的值要有过程啊
1.设A={2,-1,x²-x+1}B={2y,-4,x+4}C={-1,7}且 A∩B=C 求x y的值
A={2,-1,7}
B={-4,-1,7}
得x²-x+1=7
所以x=3,x+4=7
2y=-1
y=-1/2
2.设A={a²,a+1,-3} B={a-3,2a-1,a²+1} A∩B={-3}求a的值
a²+1>a²
a²+1>-3
所以有a²+1≠a+1
得a≠0
a-3≠-3
必有2a-1=-3
得a=-1