Little Ming and Little Red shared a book. In the first three minutes, Xiao Ming typed 78 words and Xiao Hong typed 300 words. How many words are there in this book? Anxious!
This book had a total of $2,000,000 - 78,000,000 = 33678$words. Little Ming typed $78$, Little Red typed $300$, and the total was $2,000,000. Subtracting the $78 words that Xiaoming typed, the remaining words were $20000 - 78 = 19922 words. Therefore, the book had a total of $33678 words.
Little Ming wanted to choose a mathematician's story and another book to give to Little Red and Little Ming respectively. How many ways to give it to them and how to write the calculations?
假设小明想选的数学家的故事书有 $n$ 页小红想选的一本书有 $m$ 页则小明想选的这本书有 $n+m$ 页. 小明想选数学家的故事和一本其他的书分别有多少种送法可以通过乘法原理进行计算. 首先小明可以选 $n$ 页的数学家的故事书这一种选法有 $C_n$ 种选择. 然后小明还可以选择 $m$ 页的其他书这一种选法有 $C_m$ 种选择. 因此小明想选的数学家的故事和其他书的送法总数为 $C_n C_m$即 $$C_n C_m = \frac{n!}{m!(n-m)!}$$ 其中$!$ 表示阶乘运算. 现在假设小明想选的数学家的故事书有 $n$ 页小红想选的一本书有 $m$ 页则小明想选的这本书有 $n+m$ 页. 小明想选的这本书可以送给小红 $C_n$ 页也可以送给小红 $C_n$ 页还可以送给小红没有页的空页这一种送法有 $C_n$ 种选择. 因此小红想选的一本书可以送给小明 $C_n$ 页也可以送给小明 $C_n$ 页还可以送给小明没有页的空页这一种送法有 $C_n$ 种选择. 因此小明想选的数学家的故事和其他书的送法总数为 $C_n C_m$即 $$C_n C_m = \frac{n!}{m!(n-m)!} \times C_n \times C_n$$ 其中$!$ 表示阶乘运算. 因此我们可以得到下面的算式: $$C_n C_m = \frac{n!}{m!(n-m)!} \times \frac{n!}{n!} = \frac{n(n-1)(n-2)\cdots(2)(1)}{m(m-1)(m-2)\cdots(3)(1)} = \frac{nm(n-m)}{2}$$ 其中分子计算省略分母是 $n$ 和 $m$ 的阶乘之和.
Xiao Ming read all kinds of books and typed a four-character idiom
Xiao Ming has read all kinds of books and is well-read.
Little Red Book
Little Red Book
Little Red Book was a lifestyle platform founded by Mao Wenchao and Qu Fang in Shanghai in 2013. Its mission was to record life through Short videos, pictures, and other forms, share lifestyle, and form an interaction community platform based on interests. As of October 2019, the number of monthly active users of Little Red Book had exceeded 100 million, of which 70% were born in the 1990s and continued to grow rapidly. The product name of Little Red Book was Little Red Book. The logo was red with white characters, and the slogan was " Mark My Life." The Little Red Book also had a computer version of the app, which allowed one to enjoy the content and services of the Little Red Book App on the computer. The Little Red Book's characteristic group was a large number of people based on user portraits and tags. Little Red Book's market value had already exceeded 20 billion USD. It was a company with great potential.
The Little Red Book
There were many cross-book novels recommended in the Little Red Book, including " Suddenly Like A Sick Woman,"" I Have The Dominator's Halo [Cross-book]," The Paranoid Male Lead, White Moonlight, I'm Not Going To Be A Salted Fish In The Entertainment Industry's Cool Story [Entry]," The Buddhist Girl's Daily Cross-book], and so on. These novels covered different topics and styles, and readers could choose to read them according to their preferences.
The Little Red Book
The following are some recommendations for military pet novels, suitable for reading in Little Red Book: 1. " My Youth Begins From Loving You ": This novel tells the story of a cold and rigorous military male protagonist and a gentle and quiet female protagonist. They experienced a series of ordinary but warm moments of happiness, such as meeting, falling in love, getting married, and having children. This novel was rated at 8.2 points. It was an absolutely heart-warming and sweet novel. 2. << Pet Marriage >>: This novel described the story between a soldier male protagonist and a doctor female protagonist. The male protagonist doted on the female protagonist. The early stages were full of sweetness, but there were some heartbreaking scenes later on. The ending of this novel was happy, and the author's writing style was not bad. 3. The male protagonist of this novel is a handsome soldier or criminal police officer, and the female protagonist is a beautiful doctor. The story told the story of how the male protagonist protected his country and the female protagonist. This novel was a sweet favorite novel that made people feel warmth and the power of protection. The above are some of the recommended military pet novels based on the search results provided. I hope it will be helpful to you!
The Little Red Book
The following are some recommendations for novels about the female protagonist's rebirth, suitable for reading in Little Red Book: 1. "Cousin Wan Fu": This is an ancient novel. It tells the story of the female protagonist who, due to the tragedy in her previous life, tries to marry the male protagonist in order to seek peace in this life. The male protagonist was a gentle gentleman. In the early stages, he was angry with the female protagonist's scheming. After marriage, it was really sweet. This novel received a lot of attention. 2. "National Beauty and Fragrance": This is also an ancient novel. The female protagonist clings to a thigh after her rebirth. The plot is not mentioned. This novel was also very popular. 3. "Doomsday Female Lead Becomes a King": This was a niche urban rebirth novel. It described the female protagonist facing the threat of zombies and beasts in the apocalypse, as well as the waves of female supporting characters who entered the apocalypse and were reborn. How would she become the queen of the apocalypse? 4. "Rebirth Healing Fictions, Little Red Book": This novel tells the story of the female lead, Bei Yao, and the male lead, Pei Chuan. Bei Yao was reborn back in 1996, met Pei Chuan, and gradually cured his introverted inferiority complex. This was a sweet and loving novel. 5. "Fake Prince Consort, Real Empress": This was a sweet novel about rebirth. The story described He Gu's choice after rebirth, whether to become the Crown Prince's confidant or to marry the rumored noble and cold Eldest Princess. Please note that the novels recommended above are based on the search results provided. There may be other novels that are suitable for the female protagonist's rebirth that have not been mentioned.
The Little Red Book
The Little Red Book had many recommendations for villains. Some of the recommended villain novels included The Protagonist Always Wants to Steal My Chance [Transcension], The Female Supporting Character Has Not Been Sick for Several Years, After Dressing as a Villain Boss, A Guide to Saving Villains (Transcension), and Domesticating Villains (Transcension). These novels covered different plots and topics, suitable for readers who liked villainous stories.
The Little Red Book
We can conclude that there are many types of popular novels recommended by Little Red Book, including sweet pet novels, transmigration novels, Chinese manga novels, and so on. However, there was no clear information on which novels were recommended. Therefore, it was impossible to provide specific answers to the popular novels recommended by Little Red Book.
Little Red Book
Here are some recommendations for funny female novels: 1. " My bitter life of raising children in ancient times ": The heroine traveled to ancient times and became a teacher in a school. She lived a happy life. The ending was He. 2. "Ba Chong Lazy Concubine": Ancient romance-business farming novel, content spoiling funny, one-on-one without abuse. 3. " Happy Memories ": This novel tells the story of a bandit family who had just been recruited. The plot is compact and the development is fast. It is very enjoyable to read. 4. " Transformed Monster Mother,"" The Tutoring Diary of a Crossdressing Big Boss,"" Forced to Hide Her Marriage with a Big Boss,"" Big Sword Nanny,"" Don't Be Angry, Senior Sister,"" Transformed Beauty,"" Transformed Immortal Cultivation Female Brainiac,"" Transformed Beauty,"" Reborn I Want Girls,"" Transformed Goddess of the Three Realms,"" Live Transformed Pirate Empress,"" Funny Campus: Five Radish, Five Pit," and so on. These novels all had funny plots and a relaxed style, suitable for girls to read. I hope you like these recommendations!