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3.4*10^2+1.8*10^3
http://www.wolframalpha.com/input/?i=3.4*10%5E2%2B1.8*10%5E3
(34/10)*10^2+(18/10)*10^3
http://www.wolframalpha.com/input/?i=%2834%2F10%29*10%5E2%2B%2818%2F10%29*10%5E3
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2140