英语作文 旅行社新推出了火星旅行的旅游线路,假设你上周

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我就是做旅游的,个人认为：跟团：安全可以保障,但是不自由,人太多景点不能全部游览只能看到精华部分,难免发生不愉快的事情自助：相对自由,可以放松心情,可以根据自己的时间调整行程安排相对最大的优缺点就是这

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现在是2015年.我们学校组织了一次去火星的旅行.在火星上,我们掩盖不住激动的心情,到处参观起来,说实话,这里的实景与我们想像的完全不一样,遍地都是奇形怪状的石头.同学们在一起唱着歌,跳着舞,疯狂的大

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1）、Y甲=（400*0.75）*XY乙=（400*0.8）*（X-1）2）将10代入上算式,Y甲=3000元,Y乙=2880元,乙更优惠3）即解析（400*0.75）*X<（400*0.8）*（X-

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