Friday, 17 April 2020

Cheng Rui's answer


A little bit unclear though... hope that it is not too hard to read


Feedback: 
🧐 Note that there are "+" among the terms in the numerator; similar situation for denominator. 
We can only "cancel" away the common factors if all the terms in the numerator & denominator mutliply to each other. So, the "cancelling" here is not valid.

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