\(\dfrac{6}{18}+\dfrac{7}{8}=\dfrac{3}{8}+\dfrac{7}{8}=\dfrac{10}{8}=\dfrac{5}{4}\)
=>Chọn C
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\(\dfrac{6}{18}+\dfrac{7}{8}=\dfrac{3}{8}+\dfrac{7}{8}=\dfrac{10}{8}=\dfrac{5}{4}\)
=>Chọn C