过去五年,我国的扶贫工作进入了“精准扶贫”阶段.目前“精准扶贫”覆盖了全部贫困人口,东部帮西部,全国一盘棋的扶贫格局逐渐形成,到2020年底全国830个贫困县都将脱贫摘帽,最后4335万贫困人口将全部脱贫,这将超过全球其他国家过去30年脱贫人口的总和,2020年是我国打赢脱贫攻坚战收官之年,越是到关键时刻,更应该强调“精准”.为落实“精准扶贫”政策,某扶贫小组计划对甲、乙两个项目共投资100万元,并且规定每个项目至少投资20万元.依据前期市场调研可知:甲项目的收益
![](https://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmi%3Ep%3C%2Fmi%3E%3Cmrow%3E%3Cmo%3E%28%3C%2Fmo%3E%3Cmi%3Et%3C%2Fmi%3E%3Cmo%3E%29%3C%2Fmo%3E%3C%2Fmrow%3E%3C%2Fmrow%3E%3C%2Fmath%3E)
(单位:万元)与投资t(单位:万元)满足
![](https://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmi%3Ep%3C%2Fmi%3E%3Cmrow%3E%3Cmo%3E%28%3C%2Fmo%3E%3Cmi%3Et%3C%2Fmi%3E%3Cmo%3E%29%3C%2Fmo%3E%3C%2Fmrow%3E%3Cmo%3E%3D%3C%2Fmo%3E%3Cmo%3E%E2%88%92%3C%2Fmo%3E%3Cmfrac%3E%3Cmn%3E1%3C%2Fmn%3E%3Cmrow%3E%3Cmn%3E800%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmfrac%3E%3Cmsup%3E%3Cmi%3Et%3C%2Fmi%3E%3Cmn%3E3%3C%2Fmn%3E%3C%2Fmsup%3E%3Cmo%3E%2B%3C%2Fmo%3E%3Cmn%3E6%3C%2Fmn%3E%3Cmi%3Et%3C%2Fmi%3E%3C%2Fmrow%3E%3C%2Fmath%3E)
;乙项目的收益
![](https://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmi%3Eg%3C%2Fmi%3E%3Cmrow%3E%3Cmo%3E%28%3C%2Fmo%3E%3Cmi%3Et%3C%2Fmi%3E%3Cmo%3E%29%3C%2Fmo%3E%3C%2Fmrow%3E%3C%2Fmrow%3E%3C%2Fmath%3E)
(单位:万元)与投资t(单位:万元)的数据情况如表:
设甲项目的投入为x(单位:万元),两个项目的总收益为
(单位:万元).