Решите с объяснением

Ответ

Автор - alesyaperova

Ответ:

$4. \ 1)2 frac{2}{3} + 1 frac{3}{7} = 2 frac{2 times 7}{21} + 1 frac{3 times 3}{21} =$

$2 frac{14}{21} + 1 frac{9}{21} = 3 frac{23}{21} = 4 frac{2}{21}$

$2)4 frac{2}{21} x times 21 = 58 \ 4 frac{2}{21} x = 58 div 21 \$

$4 frac{2}{21} x = 2 frac{16}{21} \ x = 2 frac{16}{21} div 4 frac{2}{21}$

$x = frac{58}{21} div frac{86}{21} = frac{58}{21} times frac{21}{86} \ x = frac{58}{86} = frac{29}{43}$

58/86 сократили на 2, то есть Разделили на 2

Ответ:х=29/43

$1)2 frac{5}{10} - 1 frac{1}{6} = 2 frac{5 times 3}{30} - 1 frac{1 times 5}{30} = \ = 2 frac{15}{30} - 1 frac{5}{30} = 1 frac{10}{30} = 1 frac{1}{3}$

$2)(1 frac{1}{3} ) {}^{2} = ( frac{4}{3} ) {}^{2} = frac{16}{9} = 1 frac{7}{9}$

$3)1 frac{7}{9} times frac{27}{32} = frac{16}{9} times frac{27}{32} = frac{3}{2} = 1 frac{1}{2}$

$4)1 frac{1}{2} - 1 frac{6}{13} = 1 frac{13}{26} - 1 frac{12}{26} = frac{1}{26}$