34+5:7
243/7
Tham khảo cách cộng trừ hai phân số: https://vndoc.com/giai-bai-1-2-3-trang-10-sgk-toan-5-on-tap-phep-cong-va-phep-tru-hai-phan-so-115625
1/3;1/4và4/5
243
\(34+5:7=34+\frac{5}{7}=\frac{238}{7}+\frac{5}{7}=\frac{243}{7}\)
1/3;1/4;4/5