已知集合P=(x\x大于等于0小于等于4),Q=(y\y大于等于0小于等于2),下列关系中是从P到Q的映射的是:(1)f:x—y=x/2 (2) f :x—y=x-2 (3)f :x—y=根号x,(4)f :x—y=x-2的绝对值答案是(1),(3),为什么?
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/20 05:44:28
![已知集合P=(x\x大于等于0小于等于4),Q=(y\y大于等于0小于等于2),下列关系中是从P到Q的映射的是:(1)f:x—y=x/2 (2) f :x—y=x-2 (3)f :x—y=根号x,(4)f :x—y=x-2的绝对值答案是(1),(3),为什么?](/uploads/image/z/14325575-23-5.jpg?t=%E5%B7%B2%E7%9F%A5%E9%9B%86%E5%90%88P%3D%28x%5Cx%E5%A4%A7%E4%BA%8E%E7%AD%89%E4%BA%8E0%E5%B0%8F%E4%BA%8E%E7%AD%89%E4%BA%8E4%29%2CQ%3D%28y%5Cy%E5%A4%A7%E4%BA%8E%E7%AD%89%E4%BA%8E0%E5%B0%8F%E4%BA%8E%E7%AD%89%E4%BA%8E2%29%2C%E4%B8%8B%E5%88%97%E5%85%B3%E7%B3%BB%E4%B8%AD%E6%98%AF%E4%BB%8EP%E5%88%B0Q%E7%9A%84%E6%98%A0%E5%B0%84%E7%9A%84%E6%98%AF%EF%BC%9A%EF%BC%881%EF%BC%89f%3Ax%E2%80%94y%3Dx%2F2+%282%29+f+%3Ax%E2%80%94y%3Dx-2+%283%29f+%3Ax%E2%80%94y%3D%E6%A0%B9%E5%8F%B7x%2C%EF%BC%884%EF%BC%89f+%3Ax%E2%80%94y%3Dx-2%E7%9A%84%E7%BB%9D%E5%AF%B9%E5%80%BC%E7%AD%94%E6%A1%88%E6%98%AF%281%29%2C%283%29%2C%E4%B8%BA%E4%BB%80%E4%B9%88%3F)
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