выполните действия: [tex]1) 4\frac{2}{7} *1\frac{13}{15} -2\frac{1}{13} *1\frac{4}{9} ; 2) 2,4*1\frac{5}{12}*1\frac{7}{17} -3\frac{1}{7} :1\frac{4}{7}[/tex] ДАЮ 18 БАЛЛОВ!!!!!!!!!
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