17) \(\frac{2}{7} \cdot \frac{21}{22} =\) 18) \(\frac{8}{15} \cdot \frac{25}{32} =\) 19) \(\frac{12}{35} \cdot \frac{14}{15} =\) 20) \(\frac{2}{9} \cdot \frac{3}{8} =\) 21) \(\frac{5}{6} \cdot \frac{12}{35} =\) 22) \(\frac{7}{8} \cdot \frac{8}{40} =\) 23) \(\frac{27}{32} \cdot \frac{4}{5} =\) 24) \(\frac{45}{49} \cdot \frac{7}{10} =\) 25) \(\frac{12}{15} \cdot \frac{35}{36} =\) 26) \(\frac{18}{77} \cdot \frac{14}{27} =\) 27) \(\frac{22}{25} \cdot \frac{5}{33} =\) 28) \(\frac{48}{49} \cdot \frac{35}{16} =\) 29) \(\frac{7}{60} \cdot \frac{10}{21} =\) 30) \(\frac{12}{100} \cdot \frac{25}{4} =\) 31) \(4 \cdot \frac{1}{6} =\) 32) \(7 \cdot \frac{2}{7} =\) 33) \(9 \cdot \frac{5}{18} =\) 34) \(8 \cdot \frac{3}{16} =\) 35) \(12 \cdot \frac{7}{18} =\) 36) \(4 \cdot \frac{3}{14} =\) 37) \(21 \cdot \frac{5}{9} =\) 38) \(44 \cdot \frac{4}{33} =\) 39) \(15 \cdot \frac{3}{10} =\) 40) \(43 \cdot \frac{10}{43} =\) 41) \(22 \cdot \frac{3}{26} =\) 42) \(39 \cdot \frac{4}{13} =\) 43) \(42 \cdot \frac{6}{7} =\) 44) \(16 \cdot \frac{1}{16} =\) 45) \(36 \cdot \frac{4}{9} =\)

Давай решим эти примеры на умножение дробей. Сначала вспомним, как это делается: чтобы умножить дробь на дробь, нужно умножить числители и знаменатели. 17) \(\frac{2}{7} \cdot \frac{21}{22} = \frac{2 \cdot 21}{7 \cdot 22} = \frac{42}{154} = \frac{3}{11}\) 18) \(\frac{8}{15} \cdot \frac{25}{32} = \frac{8 \cdot 25}{15 \cdot 32} = \frac{200}{480} = \frac{5}{12}\) 19) \(\frac{12}{35} \cdot \frac{14}{15} = \frac{12 \cdot 14}{35 \cdot 15} = \frac{168}{525} = \frac{8}{25}\) 20) \(\frac{2}{9} \cdot \frac{3}{8} = \frac{2 \cdot 3}{9 \cdot 8} = \frac{6}{72} = \frac{1}{12}\) 21) \(\frac{5}{6} \cdot \frac{12}{35} = \frac{5 \cdot 12}{6 \cdot 35} = \frac{60}{210} = \frac{2}{7}\) 22) \(\frac{7}{8} \cdot \frac{8}{40} = \frac{7 \cdot 8}{8 \cdot 40} = \frac{56}{320} = \frac{7}{40}\) 23) \(\frac{27}{32} \cdot \frac{4}{5} = \frac{27 \cdot 4}{32 \cdot 5} = \frac{108}{160} = \frac{27}{40}\) 24) \(\frac{45}{49} \cdot \frac{7}{10} = \frac{45 \cdot 7}{49 \cdot 10} = \frac{315}{490} = \frac{9}{14}\) 25) \(\frac{12}{15} \cdot \frac{35}{36} = \frac{12 \cdot 35}{15 \cdot 36} = \frac{420}{540} = \frac{7}{9}\) 26) \(\frac{18}{77} \cdot \frac{14}{27} = \frac{18 \cdot 14}{77 \cdot 27} = \frac{252}{2079} = \frac{4}{33}\) 27) \(\frac{22}{25} \cdot \frac{5}{33} = \frac{22 \cdot 5}{25 \cdot 33} = \frac{110}{825} = \frac{2}{15}\) 28) \(\frac{48}{49} \cdot \frac{35}{16} = \frac{48 \cdot 35}{49 \cdot 16} = \frac{1680}{784} = \frac{15}{7}\) 29) \(\frac{7}{60} \cdot \frac{10}{21} = \frac{7 \cdot 10}{60 \cdot 21} = \frac{70}{1260} = \frac{1}{18}\) 30) \(\frac{12}{100} \cdot \frac{25}{4} = \frac{12 \cdot 25}{100 \cdot 4} = \frac{300}{400} = \frac{3}{4}\) 31) \(4 \cdot \frac{1}{6} = \frac{4}{1} \cdot \frac{1}{6} = \frac{4 \cdot 1}{1 \cdot 6} = \frac{4}{6} = \frac{2}{3}\) 32) \(7 \cdot \frac{2}{7} = \frac{7}{1} \cdot \frac{2}{7} = \frac{7 \cdot 2}{1 \cdot 7} = \frac{14}{7} = 2\) 33) \(9 \cdot \frac{5}{18} = \frac{9}{1} \cdot \frac{5}{18} = \frac{9 \cdot 5}{1 \cdot 18} = \frac{45}{18} = \frac{5}{2}\) 34) \(8 \cdot \frac{3}{16} = \frac{8}{1} \cdot \frac{3}{16} = \frac{8 \cdot 3}{1 \cdot 16} = \frac{24}{16} = \frac{3}{2}\) 35) \(12 \cdot \frac{7}{18} = \frac{12}{1} \cdot \frac{7}{18} = \frac{12 \cdot 7}{1 \cdot 18} = \frac{84}{18} = \frac{14}{3}\) 36) \(4 \cdot \frac{3}{14} = \frac{4}{1} \cdot \frac{3}{14} = \frac{4 \cdot 3}{1 \cdot 14} = \frac{12}{14} = \frac{6}{7}\) 37) \(21 \cdot \frac{5}{9} = \frac{21}{1} \cdot \frac{5}{9} = \frac{21 \cdot 5}{1 \cdot 9} = \frac{105}{9} = \frac{35}{3}\) 38) \(44 \cdot \frac{4}{33} = \frac{44}{1} \cdot \frac{4}{33} = \frac{44 \cdot 4}{1 \cdot 33} = \frac{176}{33} = \frac{16}{3}\) 39) \(15 \cdot \frac{3}{10} = \frac{15}{1} \cdot \frac{3}{10} = \frac{15 \cdot 3}{1 \cdot 10} = \frac{45}{10} = \frac{9}{2}\) 40) \(43 \cdot \frac{10}{43} = \frac{43}{1} \cdot \frac{10}{43} = \frac{43 \cdot 10}{1 \cdot 43} = \frac{430}{43} = 10\) 41) \(22 \cdot \frac{3}{26} = \frac{22}{1} \cdot \frac{3}{26} = \frac{22 \cdot 3}{1 \cdot 26} = \frac{66}{26} = \frac{33}{13}\) 42) \(39 \cdot \frac{4}{13} = \frac{39}{1} \cdot \frac{4}{13} = \frac{39 \cdot 4}{1 \cdot 13} = \frac{156}{13} = 12\) 43) \(42 \cdot \frac{6}{7} = \frac{42}{1} \cdot \frac{6}{7} = \frac{42 \cdot 6}{1 \cdot 7} = \frac{252}{7} = 36\) 44) \(16 \cdot \frac{1}{16} = \frac{16}{1} \cdot \frac{1}{16} = \frac{16 \cdot 1}{1 \cdot 16} = \frac{16}{16} = 1\) 45) \(36 \cdot \frac{4}{9} = \frac{36}{1} \cdot \frac{4}{9} = \frac{36 \cdot 4}{1 \cdot 9} = \frac{144}{9} = 16\)

Ответ: Выше приведены ответы на каждый пример.

Молодец! Ты отлично справился с умножением дробей. Продолжай в том же духе, и у тебя все получится!