写一个单项式使它和多项式m加2n的和为单项式？
- My Favoarite Online Course根据这个题目写一篇不少于80个词的短文，急哈。。。
- 八零九零湊一对，猜三个数字。
- m.2-class/login？
- 已知(m-2)²与丨n+1丨互为相反数，求多项式3mn-13n²-5mn+15m²-2n²
My Favoarite Online Course根据这个题目写一篇不少于80个词的短文，急哈。。。
Some time ago, If you ask me which course my favorite is, I would tell you that is computer. But now my favorite course is not computer but English.
At one time I even didn’t go to English class when I was freshman at college. Of course I didm’t know what the teacher tell us. But now I don’t know yet. I am still playing truant.And I will tall about the content and character of the English course in my own opinion.English course includes listening,speaking,reading and writing.As a student, English is not mother tongue,who have to increase his vocabulary at first don’t like the English-speaking just listening and speaking.The character,when you study English words, your pronunciation must be exactly right in order that you can know it when you hear.
Even though the last ECT-4 I failed, which didn’t decrease the interest of English.English give me the new world and I can know more information than before from Internet.It help me open my sight.Now I can talk to foreign student and can learn more knowledge by reading. Now I can read some latest articles,which are written by English,about my major,computer, from the internet or newspaper. I like English most, though it is not my major,even I have not passed the ECT-4.
八零九零湊一对，猜三个数字。
八零九零凑一对，猜三个数字——答案：892。
对
【基本解释】
1. 答，答话，回答 ：～答如流。无言以～。
2. 朝着 ：～酒当歌。
3. 处于相反方向的 ：～面。
4. 跟，和 ：～他商量一下。
5. 互相，彼此相向地 ：～立。～流。～接。～称（chèn）。～峙。
6. 说明事物的关系 ：～于。～这事有意见。
7. 看待，应付 ：～待。
8. 照着样检查 ：核～。校（jiào）～。
9. 投合，适合，使相合 ：～应（yìng）。～劲。
10. 正确，正常，表肯定的答语 ：神色不～。
11. 双，成双的 ：配～。～偶。～仗（律诗、骈文等按照字音的平仄和字义做成对偶的语句）。
12. 平分，一半 ：～开。
13. 搀和（多指液体） ：～水。
14. 量词，双 ：一～鹦鹉。
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已知(m-2)²与丨n+1丨互为相反数，求多项式3mn-13n²-5mn+15m²-2n²
m=2, n=-1.
3mn-13n²-5mn+15m²-2n²
=15m²-2mn-15n²
=60+4-15
=49.