Do you know what is to compare? Than what be equal to what be? That follows me to enter mathematical scope of operation together at once!
你知道什么是比吗？比等于的是什么呢？那就赶快跟我一起进入数学天地吧！
First for a problem - - what is to compare. Of two number divide than showing two several photographs, we also can say is, two several photographs are compared except what show two number. Carry these two simple sentences, we knew, what is to compare this to be called to define in maths. Will answer the 2nd question again - - than what be equal to. We learned formulary A: B=a÷b=a/b, can be informed so calculate type than be equal to division, also can represent a fraction. If want to do,understand this problem, we continue to study downward even.
先来说一个问题－－什么是比。两个数的比表示两个数相除，我们也可以说成是，两个数相除表示两个数的比。通过这两句简单的话，我们就知道了，什么是比这在数学中被称为定义。再来回答第二个问题－－比等于什么。我们学了公式a：b=a÷b=a/b，所以可以得知比等于除法算式，也可以表示分数。如果想搞明白这个题，我们还要继续往下研究。
Each compared shares are famous word, the body that resembles us in that way, have a hand, have a foot, have a head, have limb. Be called than the number before date those who compare is ditto, be called than the number at the back of date those who compare hind. Still one is called ratio, ratio is ditto after dividing business. Somebody may ask, is that ditto after mixing between two what does the dot call? Make compare number. Comparing number is to write than appropriative, he still is equivalent to division removing name mediumly or the fractional line in the mark. Ditto the dividend in also be equivalent to division or the denominator in the mark. After that the dividend in be equivalent to division or the element in the mark. Still assimilate to article is worth the business in be equivalent to division calculating type. After having these knowledge, rejoin the 2nd question is much simpler!
比的各个部分都是有名字，就像我们的身体那样，有手、有脚、有脑袋、有四肢。比号前面的数叫做比的前项，比号后面的数叫做比的后项。还有一个叫做比值，比值就是前项除以后项的商。有人可能会问，那前项和后项之间的两个点叫什么呢？叫比号。比号是写比专用的，他还相当于除法中的除号或者是分数中的分数线。前项也就相当于除法中的被除数或者是分数中的分母。而后项就相当于除法中的被除数或者是分数中的分子。还有比作文值就相当于除法算式中的商。有了这些知识以后，再回答第二个问题就简单多了！
After knowing compared each part name, we can be done a few simple, concern the problem of compared knowledge. Like 3: =24; : 8=0. 5 wait for a problem. I can teach you a few simple methods! Had listened! After begging, use ditto except with ratio; Beg ditto, after be being used multiply with ratio; Seek specific value much simpler, should use only ditto after dividing went! Can reach from this, the answer in the first problem is 1/8, the 2nd should fill to the problem 4. Really handy!
知道了比的各部分名称以后，我们就可以做一些简单的、有关比的知识的题了。如3：=24；：8=0。5等题。我可以教你一些简单的方法哦！听好了！求后项，就用前项除以比值；求前项，就用后项乘以比值；求比值就简单多了，只要用前项除以后项就行了！由此可以得出，第一道题中的答案是1/8，第二到题应该填4。真简便呀！
But somebody should ask: If ratio is not handy, with need not reduction of a fraction, how Where is reduction of a fraction? With. Listen to me to say: What “ compares is ditto after mixing be multiplied at the same time or divide with same number 0 except ratio is changeless. This is compared main character. ” basis this, we undertake changing with respect to OK and very good contrast brief. Be like 1/6: 9/2= , type calculates medium in this, we should find out denominator first 6 will multiply with the lowest common multiple of 9. Remember if number is integral, and ditto after mixing without fair factor till 1 except.
但是有人要问了：如果比值不简便，用不用约分呢，怎么约分呢？用。听我说：“比的前项和后项同时乘或除以相同的数0除外比值不变。这是比的基本性质。”依据这个，我们就可以很好的对比进行化简了。如1/6：9/2=，在这个算式中，我们要先找出分母6和9的最小公倍数来乘。记住得数要是整数，而且前项和后项没有公因数为止1除外。
This is compared secret, it and mark and division have have connection. Did you learn?
这个就是比的奥妙，它与分数和除法都有都有联系。你都学会了吗？(文/董泽萱)