Question

Calculati:a) -3 intreg 2 supra 5 - ( -4 intreg 3 supra 10 ) - ( +2 intreg 4 supra 15 ) . b) ( -5 supra 36) - (-8 supra 45) - (+37 supra 54) - (-16 supra 27 ) . c) ( -3 supra 14 ) - (+ 5 supra 21) - ( -13 supra 42) - ( - 8 supra 63) repede e tema pt maine

Answer 1

$\displaystyle a).-3 \frac{2}{5} - \left(-4 \frac{3}{10} \right )- \left (+2 \frac{4}{15}\right )= - \frac{17}{5} + \frac{43}{10} - \frac{34}{15} = \\ \\ =- \frac{102}{30} + \frac{129}{30} - \frac{68}{30} =- \frac{41}{30} \\ \\ b).\left(- \frac{5}{36} \right )- \left(- \frac{8}{45} \right )- \left (+ \frac{37}{54} \right )- \left (- \frac{16}{27} \right )= \\ \\ =- \frac{75}{540} + \frac{96}{540} - \frac{370}{540} + \frac{320}{540} =- \frac{29}{540}$

$\displaystyle c).\left(- \frac{3}{14} \right )- \left(+ \frac{5}{21} \right )- \left (- \frac{13}{42} \right )- \left (- \frac{8}{63} \right )= \\ \\ =- \frac{27}{126} - \frac{30}{126} + \frac{39}{126} + \frac{16}{126} =- \frac{2}{126} =- \frac{1}{63}$