direct
indirect
and..
inverse??..(not sure..)
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the three kinds of proportions are indirect proportion, direct proportion and thepartitive proportion
... a proportion.... a proportion.... a proportion.... a proportion.
There cannot be a "proportion of something": proportion is a relationship between two things, and how you solve it depends on whether they (or their transformations) are in direct proportion or inverse proportion.
Yes, 3:6 = 4:8
1. head 2. body 3. base xiao!^^