Question

3/4 - 2/3
8/9 - 5/7
5/8 + 7/4
7/8 + 3/9
me ayudan por favor ?​

Answer 1

$\huge\red {\mid {\fbox{\tt {Hola}}\mid}}$

primer ejercicio:

$\frac{3}{4} - \frac{2}{3} = \frac{3 \times 3}{4 \times 3} - \frac{2 \times 4}{3\times 4} = \frac{9}{12} - \frac{8}{12} = \frac{9 - 8}{12} = \frac{1}{12}$

segundo ejercicio:

$\frac{8}{9} - \frac{5}{7} = \frac{8 \times 7}{9 \times 7} - \frac{5 \times 9}{7 \times 9} = \frac{56}{63} - \frac{45}{63 } = \frac{56 - 45}{63} = \frac{11}{63}$

tercer ejercicio:

$\frac{5}{8} + \frac{7}{4} = \frac{5}{8} + \frac{7 \times 2}{4 \times 2} = \frac{5}{8} + \frac{14}{8} = \frac{5 + 14}{8} = \frac{19}{8}$

cuarto ejercicio:

$\frac{7}{8} + \frac{3}{9} = \frac{7}{8} + \frac{1}{3} = \frac{7 \times 3}{8 \times 3} + \frac{1 \times 8}{3 \times 8} = \frac{21}{24} + \frac{8}{24} = \frac{21 + 8}{24} = \frac{29}{24}$