Question

ayúdame a resolver esto lo necesito ya ​

Answer 1

Respuesta:

Explicación paso a paso:

3$\\ \frac{3}{8} + \frac{4}{9} - \frac{6}{12} = \frac{27+32-36}{72}=\frac{23}{72} \\sacando mcm de 8-9-12 \\ MCM=2^{3} x 3^{2} =72$

$\frac{4}{7} - \frac{9}{19} + \frac{13}{21} = \frac{228-189+247}{399} = \frac{286}{399} \\MCM de 7-19-21 \\MCM = 3x7x19=399$

$\frac{18}{12} - \frac{3}{24} - \frac{5}{36} =\frac{108-9-10}{72} = \frac{89}{72} \\MCM de =12-24-36\\MCM = 2^{3} x 3^{2} = 72$