Anonymous

Tính: 1/7+2/7+3/7

- asked 4 months agoVotes

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Giải Toán lớp 4 Bài 75: Luyện tập

a) $\frac{1}{7} + \frac{2}{7} + \frac{3}{7}$

c) $\frac{13}{14} - \frac{5}{14} - \frac{1}{14}$

b) $\frac{2}{9} + \frac{5}{9} + \frac{8}{9}$

d) $\frac{7}{11} - \frac{4}{11} - \frac{3}{11}$

a) $\frac{1}{7} + \frac{2}{7} + \frac{3}{7} = \frac{1 + 2 + 3}{7} = \frac{6}{7}$

b) $\frac{2}{9} + \frac{5}{9} + \frac{8}{9} = \frac{2 + 5 + 8}{9} = \frac{15}{9} = \frac{5}{3}$

c) $\frac{13}{14} - \frac{5}{14} - \frac{1}{14} = \frac{13 - 5 - 1}{14} = \frac{7}{14} = \frac{1}{2}$

d) $\frac{7}{11} - \frac{4}{11} - \frac{3}{11} = \frac{7 - 4 - 3}{11} = \frac{0}{11} = 0$