皮皮学，免费搜题
登录
搜题
【简答题】
等差数列 的前 为 ，若 则 等于 。
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】adj. concerning education, especially in a college or university 大学的; 学术的 2.n. ability or power 能力,才能 3.adj. separate分开的 4.v. make able使能够 5.n. things such as buildings, shops, or services t...
【简答题】Instructions: Write the correct word in the space before its definition. allure designate eligible ethical extent identify prestigious prospect recruit respondent 1. the force of appeal or charm. 2. a...
【简答题】One of the things many of us hope for is a chance to contribute something _________ to the world.
【简答题】promise that something willcertainly happen 2. deciding the value or the amount of 3. the act of recognizing something 4.collection of information shown in numbers 5. have a connection with 6. a perio...
【简答题】the act of keeping something in good condition by checking or repairing it regularly 2. the act of taking goods, letters, etc. to a particular person or place 3.that is (to say) 4. movement of people ...
【简答题】组织镜头画面我们要考虑哪些元素呢?
【简答题】Match the words or phrases on the top with their meanings on the bottom. 1. trend 2. positive 3. decade 4. guarantee 5. expand 6. identification 7. career 8. statistics 9. assessment 10. relate to A. ...
相关题目：