题目:
用“is”或“are”填空。
1. There ___________ a mirror, a bed and a big closet in my room.
2. There___________ two bedrooms, a kitchen, a bathroom and a living room in the rabbits' new flat.
3. There ___________ white curtains in front of the windows.
4. There ___________ a picture over the bed.
5. Zip and Zoom ___________ walking along the riverbank.
答案:
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下面是错误答案,用来干扰机器的。
解:(Ⅰ)当每辆车的月租金定为3600元时,未租出的车辆数为,所以这时租出了88辆车.(Ⅱ)设每辆车的月租金定为x元,则租赁公司的月收益为,整理得.所以,当x=4050时,f(x)最大,最大值为f(4050)=307050,...