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的取值范围2.____you _____in the countryside?Yes.So I ___the life in the countryside?A.Did; use to live; am used toB.Did; use to live;used to
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![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的取值范围2.____you _____in the countryside?Yes.So I ___the life in the countryside?A.Did; use to live; am used toB.Did; use to live;used to](/uploads/image/z/5976592-16-2.jpg?t=1.%E8%AE%BE%E9%9B%86%E5%90%88A%3D%EF%BD%9Bx%7C-2%E2%89%A4x%E2%89%A4a%EF%BD%9D%2CB%3D%EF%BD%9By%7Cy%3D2x%2B3%2Cx%E2%88%88A%EF%BD%9D%2CC%3D%EF%BD%9By%3Dx2+%2Cx%E2%88%88A%EF%BD%9D%2C%E8%8B%A5B%E2%88%AAC%3DB%2C%E6%B1%82a%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B42.____you+_____in+the+countryside%3FYes.So+I+___the+life+in+the+countryside%3FA.Did%3B+use+to+live%3B+am+used+toB.Did%3B+use+to+live%3Bused+to)
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的取值范围2.____you _____in the countryside?Yes.So I ___the life in the countryside?A.Did; use to live; am used toB.Did; use to live;used to
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的取值范围
2.____you _____in the countryside?
Yes.So I ___the life in the countryside?
A.Did; use to live; am used to
B.Did; use to live;used to
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的取值范围2.____you _____in the countryside?Yes.So I ___the life in the countryside?A.Did; use to live; am used toB.Did; use to live;used to
先回答你第二题吧,选A
中文意思是:你过去经常住在城郊吗?
是的,所以我对郊区生活很习惯.
第一题,不是很明白,“y=x2”是什么意思,这个C到底要我求什么,是求Y的值域还是什么,我大致的解答一下:"y=2x+3"是一个增函数,根据题意得知,-2≤x≤a,即X=[-2,a],那么B=[-1,-2a+3].
而B∪C=B,则C∈B,即C是B的子集,如果你能求出C的值域,比如C=[m,n]
则我可以根据-1≤m≤n≤-2a+3的规则求出a的取值范围
最近比较无聊,就勉强帮你解答下吧,见谅!
楼下的白,你连C是求什么都能猜出来,是不是这道错题是你编的啊