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标题: [讨论]很搞的JJ [打印本页]

作者: JINMINGRUI 时间: 2003-2-23 19:51 标题: [讨论]很搞的JJ

. x,y均为正数，问x>y?
1) x>y^(1/2)
2）x^（1/2）>y
[确认]C
解法：画出y=x^2和y=x^(1/2)在第一象限的图像。交于(1,1)点。
观察得：同时满足条件1和2的重叠区域位于y=x直线下方，于是得：x>y

y=x直线穿过同时满足条件1和2的重叠区域，SO E？

a factory produce A and mail product to customors, mail fee is 19.xx. Sale price is 29.xx/each. (具体数计不清了）ask: how many the factory sell its product to customor this time?
i, its total revenue this time is between 280 and 315
ii, its total revenue this time is between 300 and 335

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