Дз на карточке,прошу помогите:((фото)
Привести к общему знаменателю
1. 2x/y 3y/x
2. X/6y 2y/9x
3. A/a-b b/a+b
4. 5m/m^2-n^2 7n/m-n
5. A-2b/(a+2b)^2 a+2b/a^2-2ab+b^2
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