introducem intregii in fractie
3[tex] \frac{2}{6} [/tex] = [tex] \frac{3*6+2}{6} [/tex] = [tex] \frac{20}{6} [/tex]
1[tex] \frac{5}{7} [/tex] = [tex] \frac{1*7+5}{7} [/tex] = [tex] \frac{12}{7} [/tex]
1[tex] \frac{2}{3} [/tex] = [tex] \frac{1*2+3}{3} [/tex] = [tex] \frac{5}{3} [/tex]
([tex] \frac{20}{6} [/tex]+[tex] \frac{12}{7} [/tex])*[tex] \frac{5}{3} [/tex] =
[tex] \frac{140+72}{42} [/tex] * [tex] \frac{5}{3} [/tex] = [tex] \frac{212}{42} [/tex] * [tex] \frac{5}{3} [/tex] = [tex] \frac{1060}{126} [/tex] = [tex] \frac{530}{63} [/tex]
1[tex] \frac{2}{9} [/tex] - 1[tex] \frac{1}{18} [/tex] = [tex] \frac{11}{9} [/tex] - [tex] \frac{19}{18} [/tex] = [tex] \frac{22}{18} [/tex] - [tex] \frac{19}{18} [/tex] = [tex] \frac{3}{18} [/tex] = [tex] \frac{1}{6} [/tex]
