21.149-10.1 18.(9)²-20.g 3. (9 - 19.$$ 2 15.(13) -8.4 6 2 3 3 テルテ/09 100÷2=1205 5 2 140/4-230/4 6 2 - 7 3

Ответ: Ниже приведены решения выражений.

1. 21 \(\cdot \left(\frac{1}{7}\right)^2 - 10 \cdot \frac{1}{7}\) = 21 \(\cdot \frac{1}{49} - \frac{10}{7}\) = \(\frac{21}{49} - \frac{10}{7}\) = \(\frac{3}{7} - \frac{10}{7}\) = \(\frac{3-10}{7}\) = \(-\frac{7}{7}\) = -1
2. 18 \(\cdot \left(\frac{1}{9}\right)^2 - 20 \cdot \frac{1}{9}\) = 18 \(\cdot \frac{1}{81} - \frac{20}{9}\) = \(\frac{18}{81} - \frac{20}{9}\) = \(\frac{2}{9} - \frac{20}{9}\) = \(\frac{2-20}{9}\) = \(-\frac{18}{9}\) = -2
3. 9 \(\cdot \left(\frac{1}{9}\right)^2 - 19 \cdot \frac{1}{9}\) = 9 \(\cdot \frac{1}{81} - \frac{19}{9}\) = \(\frac{9}{81} - \frac{19}{9}\) = \(\frac{1}{9} - \frac{19}{9}\) = \(\frac{1-19}{9}\) = \(-\frac{18}{9}\) = -2
4. 15 \(\cdot \left(\frac{1}{5}\right)^2 - 8 \cdot \frac{1}{5}\) = 15 \(\cdot \frac{1}{25} - \frac{8}{5}\) = \(\frac{15}{25} - \frac{8}{5}\) = \(\frac{3}{5} - \frac{8}{5}\) = \(\frac{3-8}{5}\) = \(-\frac{5}{5}\) = -1
5. 6 \(\cdot \left(\frac{1}{3}\right)^2 - 11 \cdot \frac{1}{3}\) = 6 \(\cdot \frac{1}{9} - \frac{11}{3}\) = \(\frac{6}{9} - \frac{11}{3}\) = \(\frac{2}{3} - \frac{11}{3}\) = \(\frac{2-11}{3}\) = \(-\frac{9}{3}\) = -3
6. 10 \(\cdot \left(\frac{1}{5}\right)^2 - 12 \cdot \frac{1}{5}\) = 10 \(\cdot \frac{1}{25} - \frac{12}{5}\) = \(\frac{10}{25} - \frac{12}{5}\) = \(\frac{2}{5} - \frac{12}{5}\) = \(\frac{2-12}{5}\) = \(-\frac{10}{5}\) = -2
7. 14 \(\cdot \left(\frac{1}{7}\right)^2 - 23 \cdot \frac{1}{7}\) = 14 \(\cdot \frac{1}{49} - \frac{23}{7}\) = \(\frac{14}{49} - \frac{23}{7}\) = \(\frac{2}{7} - \frac{23}{7}\) = \(\frac{2-23}{7}\) = \(-\frac{21}{7}\) = -3
8. 6 \(\cdot \left(\frac{1}{3}\right)^2 - 8 \cdot \frac{1}{3}\) = 6 \(\cdot \frac{1}{9} - \frac{8}{3}\) = \(\frac{6}{9} - \frac{8}{3}\) = \(\frac{2}{3} - \frac{8}{3}\) = \(\frac{2-8}{3}\) = \(-\frac{6}{3}\) = -2

Ответ: Ниже приведены решения выражений.