定义max{a,b}= ,已知实数x,y满足|x|≤1,|y|≤1,设z=max{x+y,2x-y},则z的取值范围是 [
定义max{a,b}=,已知实数x,y满足|x|≤1,|y|≤1,设z=max{x+y,2x-y},则z的取值范围是[]A.[-,2]B.[,2]C.[,3]D.[-,3...
定义max{a,b}= ,已知实数x,y满足|x|≤1,|y|≤1,设z=max{x+y,2x-y},则z的取值范围是 [ ] A.[- ,2]B.[ ,2]C.[ ,3]D.[- ,3]
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