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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