Контрольные задания > 196. Выполните действия: 1) 7 + 8/19; 2) 8/68 + 9; 3) 3 5/16 + 4 7/16; 4) 12 8/13 - 8 4/13; 5) 5 17/21 - 3 8/21 + 4 7/21; 6) 14 8/10 + 5 1/10 - 6 7/10. 197. Вычислите: 1) 6 5/13 + 2 8/13; 2) 5 4/7 + 3 6/7; 3) 1 - 15/19; 4) 8 - 3 4/9; 5) 7 3/8 - 2 5/8; 6) 14 15/32 - 9 19/32. 198. Решите уравнение: 1) x - 7 8/11 = 2 5/11; 2) 3 7/17 - (x + 1 4/17) = 1 9/17.
Вопрос:

196. Выполните действия: 1) 7 + 8/19; 2) 8/68 + 9; 3) 3 5/16 + 4 7/16; 4) 12 8/13 - 8 4/13; 5) 5 17/21 - 3 8/21 + 4 7/21; 6) 14 8/10 + 5 1/10 - 6 7/10. 197. Вычислите: 1) 6 5/13 + 2 8/13; 2) 5 4/7 + 3 6/7; 3) 1 - 15/19; 4) 8 - 3 4/9; 5) 7 3/8 - 2 5/8; 6) 14 15/32 - 9 19/32. 198. Решите уравнение: 1) x - 7 8/11 = 2 5/11; 2) 3 7/17 - (x + 1 4/17) = 1 9/17.

Смотреть решения всех заданий с листа

Ответ:

196. Выполните действия:

  1. 7 + $$ rac{8}{19}$$ = $$ rac{7 \cdot 19 + 8}{19}$$ = $$ rac{133 + 8}{19}$$ = $$ rac{141}{19}$$ = 7$$\frac{8}{19}$$
  2. $$\frac{8}{68}$$ + 9 = $$\frac{8 + 9 \cdot 68}{68}$$ = $$\frac{8 + 612}{68}$$ = $$\frac{620}{68}$$ = $$\frac{155}{17}$$ = 9$$\frac{2}{17}$$
  3. 3$$\frac{5}{16}$$ + 4$$\frac{7}{16}$$ = (3 + 4) + $$\frac{5 + 7}{16}$$ = 7 + $$\frac{12}{16}$$ = 7 + $$\frac{3}{4}$$ = 7$$\frac{3}{4}$$
  4. 12$$\frac{8}{13}$$ - 8$$\frac{4}{13}$$ = (12 - 8) + $$\frac{8 - 4}{13}$$ = 4 + $$\frac{4}{13}$$ = 4$$\frac{4}{13}$$
  5. 5$$\frac{17}{21}$$ - 3$$\frac{8}{21}$$ + 4$$\frac{7}{21}$$ = (5 - 3 + 4) + $$\frac{17 - 8 + 7}{21}$$ = 6 + $$\frac{16}{21}$$ = 6$$\frac{16}{21}$$
  6. 14$$\frac{8}{10}$$ + 5$$\frac{1}{10}$$ - 6$$\frac{7}{10}$$ = (14 + 5 - 6) + $$\frac{8 + 1 - 7}{10}$$ = 13 + $$\frac{2}{10}$$ = 13$$\frac{1}{5}$$

197. Вычислите:

  1. 6$$\frac{5}{13}$$ + 2$$\frac{8}{13}$$ = (6 + 2) + $$\frac{5 + 8}{13}$$ = 8 + $$\frac{13}{13}$$ = 8 + 1 = 9
  2. 5$$\frac{4}{7}$$ + 3$$\frac{6}{7}$$ = (5 + 3) + $$\frac{4 + 6}{7}$$ = 8 + $$\frac{10}{7}$$ = 8 + 1$$\frac{3}{7}$$ = 9$$\frac{3}{7}$$
  3. 1 - $$\frac{15}{19}$$ = $$\frac{19 - 15}{19}$$ = $$\frac{4}{19}$$
  4. 8 - 3$$\frac{4}{9}$$ = (8 - 3) - $$\frac{4}{9}$$ = 5 - $$\frac{4}{9}$$ = 4$$\frac{9}{9}$$ - $$\frac{4}{9}$$ = 4$$\frac{5}{9}$$
  5. 7$$\frac{3}{8}$$ - 2$$\frac{5}{8}$$ = (7 - 2) + $$\frac{3 - 5}{8}$$ = 5 - $$\frac{2}{8}$$ = 4$$\frac{8}{8}$$ - $$\frac{2}{8}$$ = 4$$\frac{6}{8}$$ = 4$$\frac{3}{4}$$
  6. 14$$\frac{15}{32}$$ - 9$$\frac{19}{32}$$ = (14 - 9) + $$\frac{15 - 19}{32}$$ = 5 - $$\frac{4}{32}$$ = 4$$\frac{32}{32}$$ - $$\frac{4}{32}$$ = 4$$\frac{28}{32}$$ = 4$$\frac{7}{8}$$

198. Решите уравнение:

  1. x - 7$$\frac{8}{11}$$ = 2$$\frac{5}{11}$$ $$x = 2\frac{5}{11} + 7\frac{8}{11}$$ $$x = (2+7) + \frac{5+8}{11}$$ $$x = 9 + \frac{13}{11}$$ $$x = 9 + 1\frac{2}{11}$$ $$x = 10\frac{2}{11}$$
  2. 3$$\frac{7}{17}$$ - (x + 1$$\frac{4}{17}$$) = 1$$\frac{9}{17}$$ $$3\frac{7}{17} - x - 1\frac{4}{17} = 1\frac{9}{17}$$ $$-x = 1\frac{9}{17} - 3\frac{7}{17} + 1\frac{4}{17}$$ $$-x = (1 - 3 + 1) + \frac{9 - 7 + 4}{17}$$ $$-x = -1 + \frac{6}{17}$$ $$x = 1 - \frac{6}{17}$$ $$x = \frac{17 - 6}{17}$$ $$x = \frac{11}{17}$$
ГДЗ по фото 📸
Подать жалобу Правообладателю