Помогите пожалуйста строчной надо

[latex]1) \frac{1}{2} + \frac{1}{8}= \frac{4+1}{8}= \frac{5}8} 2) \frac{1}{9} + \frac{1}{27}= \frac{3+1}{27}= \frac{x4}{27} 3) \frac{7}{8}+ \frac{1}{2}= \frac{7+4}{8}= \frac{11}{8} [/latex] 4) Не видно 5)[latex] \frac{48}{49}+ \frac{3}{7}= \frac{48+21}{49}= \frac{69}{49} [/latex] 6)[latex] \frac{1}{4}+ \frac{1}{5}= \frac{5+4}{20}= \frac{9}{20} [/latex] 7)[latex] \frac{1}{3} + \frac{1}{7} = \frac{7+3}{21} = \frac{10}{21} [/latex] 8)Не видно. 9)[latex] \frac{3}{5} + \frac{5}{6}= \frac{18+25}{30} = \frac{43}{30} [/latex] 10)[latex] \frac{2}{7} + \frac{7}{9} = \frac{18+49}{64} = \frac{67}{63} [/latex] 11)[latex] \frac{1}{2} - \frac{1}{8} = \frac{4-1}{8} = \frac{3}{8} [/latex] 12) Не видно 13)[latex] \frac{1}{6} - \frac{5}{36} = \frac{6-5}{36} = \frac{1}{36} [/latex] 14)[latex] \frac{2}{3} - \frac{5}{9} = \frac{6-5}{9} = \frac{1}{9} [/latex] 15)[latex] \frac{48}{49} - \frac{3}{7} = \frac{48-21}{49} = \frac{27}{49} [/latex] 16)[latex] \fr[latex] \frac{7}{9} - \frac{1}{2} = \frac{14-9}{18} = \frac{5}{18} 17)[/latex]ac{1}{4} - \frac{1}{3} = \frac{3-4}{12} = \frac{-1}{12} [/latex] 18)[latex] \frac{5}{7} - \frac{1}{6} = \frac{30-7}{42} = \frac{23}{42} [/latex] 19)Не могу разобрать :C 20) не видно