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Calcular "b + a" , si a5ba = 5°5?

Calcular "b + a" , si a5ba = 5°5.

5Muguethav

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<img src="https://tex.z-dn.net/?

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Flormubar

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<img src="https://tex.z-dn.net/?f=%5Coverline%7Ba5ba%7D%3D55%5E%5Ccirc%20%20%5C%5C%5C%5C%0Aa%3D5%5C%5C%5C%5C%0A%5Coverline%7B55b5%7D%3D55%5E%5Ccirc%5C%5C%5C%5C%0A5-5%2Bb-5%3D11%5E%5Ccirc%5C%5C%5C%5C%0Ab%3D11%5E%5Ccirc%2B5%5C%5C%5C%5C%0Ab%3D5%5C%5C%5C%5C%5C%5C%0A%5Cboxed%20%7Ba%2Bb%3D10%7D" />.