MATH HELP.....Adding and subtracting ration expression with UNLIKE denominators.?

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~*~G!N@~*~

New member
my teacher needs me to do some extra work cause i was sick. but its new and i dont get it.. HELP!

3m/m+6 - m+3/m+6

y^2/ 2y+4 - 4/2y+4

3x/x-4 + -12/x-4

a+b/9 - a-b/9

I DO NOT UNDERSTAD. LEAVE EXPLANATION PLEASE.. THANKS
 
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