Question

ayuda porfis espera mañana ayuda ayuda ​

Answer 1

a.

$\frac{3}{15} + \frac{8}{20} = \frac{12}{60} + \frac{24}{60} = \frac{36}{60} = \frac{9}{15} = \frac{3}{5}$

b.

$\frac{13}{18} - \frac{9}{14} = \frac{91}{126} - \frac{81}{126} = \frac{10}{126} = \frac{5}{63}$

c.

$\frac{12}{21} + \frac{7}{16} = \frac{72}{336} + \frac{147}{336} = \frac{219}{336} = \frac{73}{112}$

d.

$\frac{7}{26} + \frac{9}{30} = \frac{105}{390} + \frac{117}{390} = \frac{-12}{390} = \frac{-6}{195} = \frac{-2}{65}$