比例性质歌诀
比例性质有七条，基本性质要记牢．
分子分母交叉乘，两边的乘积恰相等．
反比定理不算难，只需把分子、分母相交换
更比定理很简单，两侧的分子分母交叉相互变．
两边的分子与分母加，合比定理就是它．
两边的分子与分母减，分比定理便会显．
合比、分比相互除，合分比定理便得出．
分子、分母各自互相加，等比定理是它不会差．
![](https://wkrtcs.bdimg.com/rtcs/image?w=338&md5sum=d09d4e3d6b210050a732253dfa726491&sign=72720bf7f5&rtcs_flag=1&rtcs_ver=3.1&l=webapp&bucketNum=37&ipr={"t":"img","w":"338","h":"168","dataType":"jpeg","c":"word/media/image1.png","imgOriW":338,"imgOriH":168})
![](https://wkrtcs.bdimg.com/rtcs/image?w=456&md5sum=d09d4e3d6b210050a732253dfa726491&sign=72720bf7f5&rtcs_flag=1&rtcs_ver=3.1&l=webapp&bucketNum=37&ipr={"t":"img","w":"456","h":"160","dataType":"jpeg","c":"word/media/image2.png","imgOriW":456,"imgOriH":160})
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