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2014-09-05T16:27:52+03:00
2 * (5 + √18) - 3(2 + √8) = 2*(5+3√2) - 3(2+2√2) 
= 10+6√2-6-6√2
= 4 
1 5 1
2014-09-05T16:28:51+03:00