Dividing Rational Expressions!

Please help with this prob. It is over fifty and I cant finish it all by my self in just 8 hours time so can anybody help me with this 15 items of expressions?

here are they:

2a+2b__________ a^2-b^2

------ Divided by ---------

a^2__________ 4a

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a^2-4__________ a^2-a-2

------ Divided by ----------

a^2-1__________ a^2+a-2

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4a^2-25 ________ 12a+30

-------- Divided by---------

a^2-16 ________ 2a^2+8a

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a^4-b^4________ a^2+b^2

-------- Divided by---------

5a-5b___________ 5

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a^2-b^2

--------- Divided by a+b

a^2+b^2