有120 个球,其中有 30 个红,32 个白的和 58 个黒的,从中取80个共有几种不同的颜色搭配

团购属于薄利多销的经营方式,够了商家设定的人数,就可以走团购价了.我就团电影票,你要直接去电影院看电影,百八十的真正常,团购呢,30来块钱,多便宜!建议就是多去知名度高的网站,团一些人较多的东西!

设每天生产X个

X*(25-10)=120*25
15X=3000
X=3000/15
X=200

每天生产200个

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第一天吃了总数的 二分之一 60个 剩余60个
第二天吃了余下的 三分之一 60*1/3=20 剩余40个
第三天吃了余下的 四分之一 40*1/4=10 剩余30个
第四天吃了余下的 五分之一 30*1/5=6 剩余24个
第五天吃了余下的 6六分之一 24*1/6=4 剩余20个

the experience of failure
要求多少字?
Failure is the thing that everyone will go through.We are all not perfect so we make mistakes.
Here i'd like to say that sometimes failure and mistakes are not bad things.Because when we are doing something,mistakes and failures means that we do not have any experiences,so we could just go in a wrong direction and end up with failure.But after we have failed,we could then conclude some reasons and problems and next time we will just avoid these problems.So the next time it could turns out to be successful.
We all know that failure is the mother of success.We might not have lighth bulb if Edison didn't have many times of failure.we have to start with failure and then learn from it.We will success at last.

My favourite things
My favourite things are books.
Why do I like books so much?Because I can learn a lot of things from books.If I read more and more books,I will know more and more things about the world.Books are useful for us.It is said that the more books you read,the more knowledge you will get.
我改了一点,

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Once man did not have to think about the protection of his environment. There were few people on the earth, and natural resources seemed to be unlimited.
Today things are different. Th...