Answer: B, C, E.
We will check each expression:
A) [tex]\frac{1}{2}+\frac{2}{4}=\frac{1}{2}+\frac{1}{2}=\frac{1+1}{2}=\frac{2}{2}=1[/tex]
B) [tex]\frac{11}{12}-\frac{1}{6}=\frac{11}{12}-\frac{2}{12}=\frac{11-2}{12}=\frac{9}{12}=\frac{3}{4}[/tex] (works)
C) [tex]\frac{3}{5}+\frac{3}{20}=\frac{12}{20}+\frac{3}{20}=\frac{12+3}{20}=\frac{15}{20}=\frac{3}{4}[/tex] (works)
D) [tex]\frac{7}{8}-\frac{1}{2}=\frac{7}{8}-\frac{4}{8}=\frac{7-4}{8}=\frac{3}{8}[/tex]
E) [tex]\frac{2}{3}+\frac{1}{12}=\frac{8}{12}+\frac{1}{12}=\frac{8+1}{12}=\frac{9}{12}=\frac{3}{4}[/tex] (works).
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