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√18+5√2-√8-3√2=V(2.3^2)+5V2-V2^3-3V2=3V2+5V2-3V2-3V2=
(3+5-3-3)*V2=2V2
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√2+√18=V2+V(2*3^2)=V2+3V2=4V2
V es raiz ( no se hacerla con el teclado, me dices como se hace?)