Решите эти примеры сами и узнайте, в каких примерах ученик допустил ошибку.

1. [tex] \frac{4}{21} [/tex]⋅[tex] \frac{7}{16} [/tex]=[tex] \frac{8}{9} [/tex]

2. 3⋅1[tex] \frac{5}{9} [/tex]=5[tex] \frac{2}{3} [/tex]

3. 4[tex] \frac{1}{5} [/tex]⋅2[tex] \frac{1}{7} [/tex]=22[tex] \frac{1}{2} [/tex]

4. 1[tex] \frac{7}{8} [/tex]⋅1[tex] \frac{1}{9} [/tex]=18

5. [tex] \frac{8}{21} [/tex]⋅1,05⋅1[tex] \frac{2}{3} [/tex]=4[tex] \frac{11}{20} [/tex]
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