помогите с алгеброй, прошу вас!

привести к общему знаменателю:

1) a/a-4 и 2/a²-16

2) 1/x²-25 и 4/5-x

3) 1/y²-9 и 1/(y+3)²

4) a/(3a-2)² и 2/4-9a²

дам 20 баллов)
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