MBA running too hot, after previous 6 months of cool.

i've 2011 13" 1.8ghz i7, bought @ launch. until week ago, it'd typically run @ 50-55 degrees c when i'm using safari & itunes, fans @ default 2000rpm. it's @ 85+ , fans spinning 3200. if quit still staying 80+. battery, inevitably, taking massive hit. suggestions?

else fails, i'll have take apple store

 

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have @ activity monitor (applications / utilities /) , select all processes , sort cpu see culprit may be.
check "system memory" tab see "page ins:", "page outs:" , "swap used:" are.

image below uses sorting cpu example

further reading:

mac os x: reading system memory usage in activity monitor
making of activity monitor
what activity monitor (or how take mac's pulse)​

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