1. I am not sure I understand why they define addition of equivalence classes as [a,b]+[c,d] = [ad+bc, bd], it does not quite make sense. I know you can randomly define addition as whatever you want, but how does this relate to similar fractions?
2. I liked going through this section because it applied everything that I am learning right now as I am studying for the test. It is interesting that they get such an intensive section all our of just a simple topic like similar fractions!
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