通过学习数学知识，我了解了许多以前从未知道的事情，比如，我知道我买菜如果买三百次两毛一斤的白菜总共多少钱；或者一个小虫在一秒钟生一个崽，下一秒那个崽和这个小虫有都可以生一个崽，那么一分钟后会出现多少小虫可以炒菜；又或者给我一些相关距离，让我去求埃菲尔铁塔的高度；亦或者在电力不足时我可以用微积分来计算它消失的速度·······感谢数学，让我知道了这么多不可思议的东西，我第一次知道不定积分和定积分原来就是素面朝天和浓妆抹艳，第一次知道很多貌似复杂公式最后结果就是0或1，第一次了解数学不只是1+1不等于2，可以等很多·····谢谢数学知识，是你让我了解我的生活原来还需要计算的

what you hear may be false.
what you see is true.

《海底两万里》英文读后感
These days, I looked at one "Seabed 20,000 Miles", this book is extremely interesting.Among them, I iceberg this content deep am moved deeply by "Seabed 20,000 Miles".
They in the South Pole area navigation, in on the road which comes back, unfortunate is surrounded by the iceberg, but they used own wisdom to save own life.
A how soul-stirring quarter! Thinks them, in the dangerous situation, they is clear-headed, has overcome the difficulty with the wisdom.Then I? I all very am from infancy to maturity timid, moreover is approaching difficultly time does not have the courage to go facing, to defeat it.
But "Seabed 20,000 Miles" have given me some courages, I should study their that kind of not fear hard and dangerous spirit!
"Seabed 20,000 Miles" although is only a risk novel, but it has given me actually many courages, it lets me face the reality bravely, do not have to become the turtle which is afraid of getting into trouble timidly!
Schoolmates, let us make contact with this marvelous submarine together, has a look the seabed forest, the coral kingdom, the mystical buried treasure and the sunken wreck! Also some many new stimulation thing waits for us to understand.
well，lets us explore together, enters together "Seabed 20,000 Miles" world.
《哈姆雷特》英文读后感
Shakspere (wrong spelling) created Hamlet--a man with wisdom and courage .In order to revenge on his uncle for killing his father, he pretented (spelling mistake) to be mad and suffered a series of misery. On the contrary, we can also say that Hamlet is rude and selfish for he did not think twice before his revenge . if (Capitalize "If" since it is the beginning word of the sentence.) a country has no king, how can a country keep alive (You need a question mark here since it is a question.) So, every thing has two sides, the bright side and adumbral side. Every time we make a decision we have to think twice.
Comment:
Be careful with your spelling, grammar, and punctuation. Too many uncessary mistakes.
It is good that you looked at both the dark and bright sides of Hamlet. Thats quite objective and convincing.