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Rút gọn rồi tính: 8/18+3/5

- asked 2 months agoVotes

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Giải Toán lớp 4 Bài 78: Luyện tập

a) $\frac{8}{18} + \frac{3}{5}$

b) $\frac{8}{24} + \frac{4}{48}$

c) $\frac{20}{15} - \frac{4}{45}$

d) $\frac{40}{32} - \frac{1}{2}$

a) $\frac{8}{18} + \frac{5}{3} = \frac{4}{9} + \frac{5}{3} = \frac{4}{9} + \frac{15}{9} = \frac{19}{9}$

b) $\frac{8}{24} + \frac{4}{48} = \frac{16}{48} + \frac{4}{48} = \frac{20}{48} = \frac{5}{12}$

c) $\frac{20}{15} - \frac{4}{45} = \frac{60}{45} - \frac{4}{45} = \frac{56}{45}$

d) $\frac{40}{32} - \frac{1}{2} = \frac{40}{32} - \frac{16}{32} = \frac{24}{12} = 2$