Question

Ai chỉ tui 2 câu này với

Answer 1

\(\dfrac{3}{8}+\dfrac{1}{4}=\dfrac{3}{8}+\dfrac{2}{8}=\dfrac{5}{8}\)

\(\dfrac{-4}{15}+\dfrac{2}{5}=\dfrac{-4}{15}+\dfrac{6}{15}=\dfrac{2}{15}\)

Answer 2

\(\text{a},=\dfrac{3+1.2}{8}=\dfrac{5}{8}\\ b,=\dfrac{-4+2.3}{15}=\dfrac{2}{15}\)

Answer 3

\(a,\dfrac{3}{8}+\dfrac{1}{4}=\dfrac{3+2}{8}=\dfrac{5}{8}.\)

\(b,\dfrac{-4}{15}+\dfrac{2}{5}=\dfrac{2}{5}-\dfrac{4}{15}=\dfrac{6-4}{15}=\dfrac{2}{15}.\)