Question

(5 1/3+2 3/5)*5/9 и (7-2 5/16)4/25 !

Answer 1

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$(5 \frac{1}{3} + 2 \frac{3}{5} ) \times \frac{5}{9} = (5 \frac{5}{15} + 2 \frac{9}{15} ) \times \frac{5}{9} = 7 \frac{14}{15} \times \frac{5}{9} = \frac{7 \times 5}{9} + \frac{14 \times 5}{15 \times 9} = \frac{35}{9} + \frac{14}{27} = 3 \frac{8}{9} + \frac{14}{27} = 3 \frac{24}{27} + \frac{14}{27} = 3 \frac{38}{27} = 4 \frac{11}{ 27}$
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$( 7- 2 \frac{5}{16} ) \times \frac{4}{25} = 4 \frac{16 - 5}{16} \times \frac{4}{25} = 4 \frac{11}{16} \times \frac{4}{25} = \frac{4 \times 4}{25} + \frac{11 \times 4}{16 \times 25} = \frac{16}{25} + \frac{11}{100} = \frac{64 + 11}{100} = \frac{75}{100} = \frac{3}{4}$