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Решите задачу:

$\frac{23}{28} * \frac{49}{46}= \frac{23}{4*7} * \frac{7*7}{2*23} = \frac{1}{4} * \frac{7}{2} = \frac{7}{8}$

$\frac{34}{86}* \frac{43}{51} = \frac{2*17}{2*43} * \frac{43}{17*3} = \frac{1}{1}* \frac{1}{3} = \frac{1}{3}$

$\frac{7}{18}* \frac{90}{77}= \frac{7}{18}* \frac{18*5}{7*11} = \frac{5}{11}$

$\frac{63}{64} * \frac{48}{91} = \frac{7*9}{16*4} * \frac{16*3}{7*13} = \frac{9*3}{4*13} = \frac{27}{52}$

$\frac{19}{100}* \frac{5}{38}= \frac{19}{5*20}* \frac{5}{19*2} = \frac{1}{20*2} = \frac{1}{40}$