Question

Urgent va rog urgent ex 1 și 8
Va roggg

Answer 1

Explicație pas cu pas:

1.a)

$= 1 - 1 + 9 - 8 = 10 - 9 = 1$

b)

$= {2}^{2} + 25 - 9 + 1 = 4 + 26 - 9 = 30 - 9 = 21$

c)

$= 1 + 1 + 2018 + 1 - 2017 = 2021 - 2017 = 4$

d)

$= \frac{ {2}^{3}(1 + 2 + {2}^{2} + {2}^{3})}{ {2}^{2}(1 + 2) } \times (1 + 3 + 9 + 27) \\ = \frac{2(1 + 2 + 4 + 8)}{3} \times 40 = \frac{2 \times 15 \times 40}{3} = 400$

8)

a)

$= 12.6 - 8.84 = 3.76$

b)

$= 1.4 \times 1.8 \div 2 = 2.52 \div 2 = 1.26$

c)

$= \left( \frac{23 - 2}{9} \times \frac{3}{10} + \frac{71 - 7}{9} \times \frac{45}{10}\right) \div \frac{12}{10} \\ = \left( \frac{21}{9} \times \frac{3}{10} + \frac{64}{9} \times \frac{45}{10}\right) \div \frac{6}{5} \\ = \left(\frac{7}{10} + \frac{64 \times 5}{10}\right) \times \frac{5}{6} = \frac{7 + 320}{10} \times \frac{5}{6} \\ = \frac{327}{12} = \frac{109}{4}$