Question

Ex 3.Va rog,! Pe a) l-am făcut doar b și c. Dau coroana la cel care răspunde primul. Repede!

Answer 1

$b) \\ \\ ( {3}^{2} \times {2}^{6} - {2}^{5} \times 6) : 12 - {2}^{5} = \\ \\ ( {3}^{2} \times 2 - 6) \times {2}^{5} : 12 - {2}^{5} = \\ \\ (9 \times 2 - 6) \times {2}^{5} : 12 - {2}^{5} = \\ \\ (18 - 6) \times {2}^{5} : 12 - {2}^{5} = \\ \\ 12 \times {2}^{5} : 12 - {2}^{5} = \\ \\ 1 \times {2}^{5} - {2}^{5} = \\ \\ 1 \times {2}^{5} - 1 \times {2}^{5} = \\ \\ (1 - 1) \times {2}^{5} = \\ \\ 0 \times {2}^{5} = \\ \\ 0$

$c) \\ \\ ( {7}^{4} - {7}^{3}) : ( {7}^{2} - 7) - {2}^{3} \times 5 = \\ \\ (7 - 1) \times {7}^{3} : (49 - 7) - 8 \times 5 = \\ \\ 6 \times {7}^{3} : 42 - 40 = \\ \\ \frac{6 \times {7}^{3} }{42} - 40 = \\ \\ \frac{ {7}^{3} }{7} - 40 = \\ \\ {7}^{2} - 40 = \\ \\ 49 - 40 = \\ \\ 9$