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[tex]\frac{1}{5}+\frac{3}{10}=\frac{2}{10}+\frac{3}{10}=\frac{5}{10}=\frac{1}{2}\\\\\frac{1}{4}+\frac{5}{8}=\frac{2}{8}+\frac{5}{8}=\frac{7}{8}\\\\\frac{1}{3}+\frac{4}{9}=\frac{3}{9}+\frac{4}{9}=\frac{7}{9}\\\\1\frac{1}{6}+3\frac{5}{12}=1\frac{2}{12}+3\frac{5}{12}=4\frac{7}{12}[/tex]
a) 1/5 + 3/10 = 2/10 + 3/10 = 5/10 = 1/2
b) 1/4 + 5/8 = 2/8 + 5/8 = 7/8
c) 1/3 + 4/9 = 3/9 + 4/9 = 7/9
d) 1 i 1/6 + 3i 5/12 = 1 i 2/12 + 3 i 5/12 = 4 i 7/12
