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a) $-2.5\times \left(3-7\right)=10$ b) $\left(4.1\times \left(-2.2\right)\right)\div \left(-1\right)=$ $C\right)$ $-25\times \left(3-7\right)-\left(41\times \left(-2.2\right)\right)\div \left(-1\right)=1C$ d) $\left(\dfrac {2} {3}-\dfrac {1} {2}\right)\times \left(\dfrac {8} {8}\div \left(-\dfrac {2} {3}\right)\right)=$ e) $\left(-\dfrac {1} {4}\times \dfrac {4} {7}\right)\div \left(-\dfrac {6} {7}\right)=$ $\left(\dfrac {2} {3}-\dfrac {1} {2}\right)\times \left(\dfrac {8} {8}\div \left(-\dfrac {2} {3}\right)\right)+\left(-\dfrac {1} {4}\times \dfrac {4} {7}\right)\div \left(-\dfrac {6} {7}\right)=$ g) $-\left(\left(3.6+4\right)\times \left(18\times \left(-5.1+3.9\right)\right)\right)=$
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Profesor de Qanda - Rubí
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