重生之神级学霸,帮忙

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提问者采纳
x=ln2000&#47,ln25(两边取对数)80^y=2000,25^x=2000, y=ln2000&#47,可得,ln2000=1(这里用到了对数的性质),ln2000
=ln2000&#47,x+1&#47,ln801&#47,ln2000
=ln(25*80)&#47,y=(ln25+ln80)&#47,可得,
(9&#47;8)a*(10&#47;9)b*(16&#47;15)c =9“a”*8“-a”*10“b”*9“-b”*16“c”*15“-c” =3“2a”*2“-3a”*2“b”*5“b”*3“-2b”*2“4c”*3“-c”*5“-c” =3“2a-2b-c”*2“-3a+b+4c”*5“b-c” (“”里的是次数)若 (9&#47;8)a*(10&#47;9)b*(16&#47;15)c=2 则 3“2a-2b-c”*2“-3a+b+4c”*5“b-c”=2所以3、5的次数为零;2的次数为一 所以2a-2b-c=0,-3a+b+4c=1,b-c=0. 解这个三元一次方程组,得:a=3,b=2,c=2
最上面那个呢
2^(x+3)-2^(x+1)=1928×2^x-2×2^x=1926×2^x=1922^x=32x=5
9^(x+1)=(3^2)^(x+1)=3^2(x+1) 3^2(x+1)-3^2x=72 3^2x(9-1)=72 3^2x=9 2x=2 x=1
不客气,祝学业有成!
那个In是什么意思?
那个In是什么意思?
以e为底的对数
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你的回答完美的解决了我的问题,谢谢!
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My pen pal is an outstanding person.我的笔友是一个出色的人。She&#39;s from China Shanghai. 她来自上海。She is 14 years old.她今年14岁。She speak English very well. 她英语说的很好。She can play the Guzheng. 她会弹古筝。She has many hobbies: watching TV, reading books, playing computer games and singing. 她有很多爱好:看电视、看书、玩电脑和唱歌。I very like she. 我非常喜欢她。 2.My pen palI have a pen pal.Her name is Nancy.She comes from England.She is 13 years old.She can speak English and a little French.Sh e is a good student.Her favorite subjects are math,history.She thinks China is a beautiful country with a long history.She can play the piano and the guitar.I think she is nice.希望有帮助,谢谢采纳 &收起
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think she is the most beautiful girl I have ever seen. 我认为她是我见过的女孩中最漂亮的一个,She is exciting, amazing and sexy. When we first met I felt her erotic emanation. Now I know that she is extremely intelligent too. (二)She is 24 years old, and she has a 3-year-old son. So she is a mother. A sharp mother. She has a piercing in her tongue and two tattoos, one on her stomach (an Indian man’s face) and one on her back (it is non-figurative). I like them very much. If you meet her, it is so sweet. She has a birthmark on the tip of her nose. (三)Sometimes I call her ”spotted nose.” It is so sweet. Really. Like a little cat. But her eyes. They are blue like the sky in spring or the ocean in a stormy night. They are so maddening. Well, let’s talk about her mouth. When she is smiling she has two little face-lines by the side of her lips. (dimples) (四)She is the most beautiful mother in the world and she is a real muse, a muse which every poet wants, lovely, wild, tender, sweet, and deep with secrets and love. A real woman. &
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你的回答完美的解决了我的问题,谢谢!
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还有一个题
哦,谢谢你给我讲上面一题
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你的回答完美的解决了我的问题,谢谢!
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来自华北水利水电大学
把两组数按从小到大的顺序排列,因为数的个数是偶数个,即中间两个数的平均数是中位数,进行解答即可;众数即出现次数最多的数字,进而得出结论.解答:解:一班平均数:(8.8+7.1+8.4+8.3+8.5+7.0+8.4+8.3+8.5+8.4+8.6+8.4)÷12,=98.7÷12,=8.225(秒);排列为:7.0<7.1<8.3=8.3<8.4=8.4=8.4=8.4<8.5=8.5<8.6<8.8;中位数为(8.4+8.4)÷2,=16.8÷2,=8.4;众数为:8.4;二班:(8.5+8.3+8.4+8.5+8.4+8.4+8.3+8.4+8.5+8.4+8.4+8.4)÷12,=100.9÷12,≈8.408(秒);排列为:8.3=8.3<8.4=8.4=8.4=8.4=8.4=8.4=8.4<8.5=8.5=8.5;中位数为:(8.4+8.4)÷2=16.8÷2,=8.4;众数为:8.4;(2)一班用平均数,二班用中位数,代表一班和二班的成绩比较合适;平均数代表一组数据的“一般水平”,而中位数代表一组数据的“中等水平”.点评:此题考查一组数据的中位数和平均数的意义和求解方法;也考查了它们的运用:平均数代表一组数据的“一般水平”,而中位数代表一组数据的“中等水平”.解答完毕 你好,百度专家组很高兴为你解答,如果你觉得有帮助,请采纳哦,谢谢!...
徐仁杰&&教师
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闫蕴霞&&学生
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而是怕我答完之后你就踩别人的了或者就是不在,谢谢,我不是骗子,请先踩那可以吗,诚信作答,所以希望谅解,我会,
你也喜欢TFBOYS啊
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桶我叫她i哈
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