Выполните умножение:. Created by Zayka10000. matematika-ru

Выполните умножение:...

Maska0 А)14/45
б)24/27
в)18/5×25/12=9×5/6= 45/6=7,5
г)30/7×14/5=12
д)21/8×4/21=1/2
е)6/7×49/18=7/3=2 1/3

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Damir1121 $\frac{7}{9}* \frac{2}{5}= \frac{7*2}{9*5}= \frac{14}{45}$
$\frac{12}{13}* \frac{26}{27} = \frac{24}{27}
$
$3 \frac{3}{5}*2 \frac{1}{12} = \frac{18}{5}* \frac{25}{12}= \frac{15}{2}=7 \frac{1}{2}$
$4 \frac{2}{7}*2 \frac{4}{5} = \frac{30}{7}* \frac{14}{5} = 12$
$2 \frac{5}{8} * \frac{4}{21}= \frac{21}{8}* \frac{4}{21}= \frac{4}{8}= \frac{1}{2}$
$\frac{6}{7} *2 \frac{13}{18} = \frac{6}{7}* \frac{49}{18}= \frac{7}{3} =2 \frac{1}{3}$

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