Răspuns:
Explicație pas cu pas:
3 1/2 + 0,5 = 7/2 + 5/10 = 7/2 + 1/2 = 8/2 = 4
7/12*4 = 7/3
1/21 - 7/3 = 1/21 - 49/21 = -48/21 = -16/7
20 - 3^3 = 20 - 27 = -7
-7*(-16/7) = 16
[tex](20 - 3 {}^{3} ) \times ( \frac{1}{21} - \frac{7}{12} \times (3 \frac{1}{2} + 0.5)) \\ \\ (20 - 27) \times ( \frac{1}{21} - \frac{7}{12} \times ( \frac{3 \times 2 + 1}{2} + \frac{5}{10} )) \\ \\ - 7 \times ( \frac{1}{21} - \frac{7}{12} \times ( \frac{7}{2} + \frac{5}{10} )) \\ \\ - 7 \times ( \frac{1}{21} - \frac{7}{12} \times ( \frac{35 + 5}{10} )) \\ \\ - 7 \times ( \frac{1}{21} - \frac{7}{12} \times \frac{40}{10} ) \\ \\ - 7 \times ( \frac{1}{21} - \frac{7}{3} \times \frac{10}{10} ) \\ \\ - 7 \times ( \frac{1}{21} - \frac{7}{3} \times 1) \\ \\ - 7 \times ( \frac{1}{21} - \frac{7}{3} ) \\ \\ - 7 \times ( \frac{1}{21} - \frac{49}{21} ) \\ \\ - 7 \times ( - \frac{48}{21} ) \\ \\ - 7 \times ( - \frac{16}{7} ) \\ \\ \frac{ - 7 \times ( - 16)}{7} \\ \\ \frac{112}{7} [/tex]
