【单选题】Directions: In this part there are 30 incomplete sentences. For each sentence there are four choices marked A, B, C and D. Choose the ONE answer that best completes the sentence. Then blacken the corr...
【简答题】某公司准备投资开发A、B两种新产品,通过市场调研发现: (1)若单独投资A种产品,则所获利润y A (万元)与投资金额x(万元)之间满足正比例函数关系:y A =kx; (2)若单独投资B种产品,则所获利润y B (万元)与投资金额x(万元)之间满足二次函数关系:y B =ax 2 +bx. (3)根据公司信息部的报告,y A ,y B (万元)与投资金额x(万元)的部分对应值如下表所示: x 1...