Математика · 5 класс Задача №3801507
А
А
Сверь числа и знаки с фото.
- Вычислите:
- \(\frac{1}{2}+\frac{4}{7}-\frac{3}{14}\);
- \(\frac{1}{5}-\frac{2}{15}+\frac{1}{30}\);
- \(\frac{1}{10}+\frac{7}{20}-\frac{2}{40}\);
- \(\frac{17}{20}-\frac{3}{10}-\frac{11}{60}\);
- \(\frac{3}{20}+\frac{7}{10}-\frac{3}{40}\);
- \(\frac{9}{40}+\frac{3}{4}-\frac{19}{20}\).
Ответ:
- \(\frac12+\frac47-\frac3{14}=\frac{7+8-3}{14}=\frac67\)
- \(\frac15-\frac2{15}+\frac1{30}=\frac{6-4+1}{30}=\frac1{10}\)
- \(\frac1{10}+\frac7{20}-\frac2{40}=\frac{4+14-2}{40}=\frac25\)
- \(\frac{17}{20}-\frac3{10}-\frac{11}{60}=\frac{51-18-11}{60}=\frac{11}{30}\)
- \(\frac3{20}+\frac7{10}-\frac3{40}=\frac{6+28-3}{40}=\frac{31}{40}\)
- \(\frac9{40}+\frac34-\frac{19}{20}=\frac{9+30-38}{40}=\frac1{40}\)