Сейчас помогу тебе с этими задачками. Они про действия с дробями, нужно быть внимательным!
Б.
1) $\left(\frac{1}{2}\right)^2 = \frac{1}{2} \cdot \frac{1}{2} = \frac{1}{4}$
2) $\left(\frac{1}{3}\right)^2 = \frac{1}{3} \cdot \frac{1}{3} = \frac{1}{9}$
3) $\left(\frac{3}{4}\right)^2 = \frac{3}{4} \cdot \frac{3}{4} = \frac{9}{16}$
4) $\left(\frac{5}{6}\right)^2 = \frac{5}{6} \cdot \frac{5}{6} = \frac{25}{36}$
5) $\left(\frac{4}{7}\right)^2 = \frac{4}{7} \cdot \frac{4}{7} = \frac{16}{49}$
6) $\left(\frac{2}{7} + \frac{4}{7}\right)^2 = \left(\frac{6}{7}\right)^2 = \frac{6}{7} \cdot \frac{6}{7} = \frac{36}{49}$
7) $\left(\frac{9}{10}\right)^2 = \frac{9}{10} \cdot \frac{9}{10} = \frac{81}{100}$
8) $\left(\frac{7}{20}\right)^2 = \frac{7}{20} \cdot \frac{7}{20} = \frac{49}{400}$
9) $\left(\frac{8}{9}\right)^2 = \frac{8}{9} \cdot \frac{8}{9} = \frac{64}{81}$
10) $\left(\frac{3}{40}\right)^2 = \frac{3}{40} \cdot \frac{3}{40} = \frac{9}{1600}$
11) $\left(\frac{1}{2}\right)^3 = \frac{1}{2} \cdot \frac{1}{2} \cdot \frac{1}{2} = \frac{1}{8}$
12) $\left(\frac{1}{3}\right)^3 = \frac{1}{3} \cdot \frac{1}{3} \cdot \frac{1}{3} = \frac{1}{27}$
13) $\left(\frac{1}{10}\right)^3 = \frac{1}{10} \cdot \frac{1}{10} \cdot \frac{1}{10} = \frac{1}{1000}$
14) $\left(\frac{3}{10}\right)^3 = \frac{3}{10} \cdot \frac{3}{10} \cdot \frac{3}{10} = \frac{27}{1000}$
15) $\left(\frac{1}{100}\right)^3 = \frac{1}{100} \cdot \frac{1}{100} \cdot \frac{1}{100} = \frac{1}{1000000}$
В.
1) $\left(\frac{7}{10} - \frac{4}{10}\right)^2 = \left(\frac{3}{10}\right)^2 = \frac{3}{10} \cdot \frac{3}{10} = \frac{9}{100}$
2) $\left(\frac{6}{7} - \frac{3}{7}\right)^2 = \left(\frac{3}{7}\right)^2 = \frac{3}{7} \cdot \frac{3}{7} = \frac{9}{49}$
3) $\left(\frac{2}{5} + \frac{3}{5}\right)^2 = \left(\frac{5}{5}\right)^2 = 1^2 = 1$
4) $\left(\frac{4}{5} - \frac{2}{5}\right)^2 = \left(\frac{2}{5}\right)^2 = \frac{2}{5} \cdot \frac{2}{5} = \frac{4}{25}$
5) $\left(\frac{4}{5} - \frac{2}{5}\right)^2 = \left(\frac{2}{5}\right)^2 = \frac{2}{5} \cdot \frac{2}{5} = \frac{4}{25}$
А.
31) $4 \frac{1}{6} \cdot 1 \frac{4}{6} = \frac{25}{6} \cdot \frac{10}{6} = \frac{250}{36} = \frac{125}{18} = 6 \frac{17}{18}$
32) $7 \frac{2}{7} = \frac{51}{7} = 7 \frac{2}{7}$
33) $9 \frac{5}{18} = \frac{167}{18} = 9 \frac{5}{18}$
34) $8 \frac{3}{16} = \frac{131}{16} = 8 \frac{3}{16}$
35) $12 \frac{7}{18} = \frac{223}{18} = 12 \frac{7}{18}$
36) $4 \frac{3}{14} = \frac{59}{14} = 4 \frac{3}{14}$
37) $21 \frac{5}{9} = \frac{194}{9} = 21 \frac{5}{9}$
6) $\frac{2}{4} + \frac{4}{7} = \frac{14}{28} + \frac{16}{28} = \frac{30}{28} = \frac{15}{14} = 1 \frac{1}{14}$
7) $\frac{8}{15} + \frac{3}{8} = \frac{64}{120} + \frac{45}{120} = \frac{109}{120}$
8) $\frac{7}{10} + \frac{4}{10} + \frac{20}{21} = \frac{11}{10} + \frac{20}{21} = \frac{231}{210} + \frac{200}{210} = \frac{431}{210} = 2 \frac{11}{210}$
9) $\frac{9}{44} + \frac{7}{15} + \frac{4}{15} = \frac{9}{44} + \frac{11}{15} = \frac{135}{660} + \frac{484}{660} = \frac{619}{660}$
10) $\frac{21}{80} + \frac{33}{35} - \frac{13}{35} = \frac{21}{80} + \frac{20}{35} = \frac{21}{80} + \frac{4}{7} = \frac{147}{560} + \frac{320}{560} = \frac{467}{560}$
11) $6 \frac{5}{18} - 15 = \frac{113}{18} - 15 = \frac{113}{18} - \frac{270}{18} = -\frac{167}{18} = -9 \frac{5}{18}$
12) $6 \frac{7}{18} - 15 = \frac{115}{18} - 15 = \frac{115}{18} - \frac{270}{18} = -\frac{155}{18} = -8 \frac{11}{18}$
13) $\frac{7}{12} - \frac{20}{35} = \frac{7}{12} - \frac{4}{7} = \frac{49}{84} - \frac{48}{84} = \frac{1}{84}$
14) $\frac{9}{28} + \frac{7}{45} = \frac{405}{1260} + \frac{196}{1260} = \frac{601}{1260}$
15) $\frac{9}{26} + \frac{13}{12} = \frac{54}{156} + \frac{169}{156} = \frac{223}{156} = 1 \frac{67}{156}$
