Explicație pas cu pas:
[tex] - \frac{15}{18} - \frac{11}{12} + 3.(2) - \frac{16}{6} = - \frac{15}{18} - \frac{11}{12} + \frac{32 - 3}{9} - \frac{16}{6} = - \frac{15 \times 2}{18 \times 2} - \frac{11 \times 3}{12 \times 3} + \frac{29 \times 4}{9 \times 4} - \frac{16 \times 6}{6 \times 6} = \frac{ - 30 - 33 + 116 - 96}{36} = \frac{116 - 159}{36} = - \frac{43}{36} [/tex]
[tex] - \frac{18}{36} + \frac{1}{9} + 0.1(5) - 0.1(25) = - \frac{1}{2} + \frac{1}{9} + \frac{15 - 1}{90} - \frac{125 - 1}{990} = -\frac{1}{2} + \frac{1}{9} + \frac{14}{90} - \frac{124}{990} = -\frac{1}{2} + \frac{1}{9} +\frac{14}{90} - \frac{124}{990} = - \frac{1 \times 495}{2 \times 495} + \frac{1 \times 110}{9 \times 110} + \frac{14 \times 11}{90 \times 11} - \frac{124}{990} = \frac{ - 495 + 110 + 154 - 124}{990} = - \frac{355}{990} = - \frac{71}{198} [/tex]
