[tex] (\frac{3}{4} - \frac{2}{5} ) - ( \frac{1}{2} - \frac{1}{5} )[/tex]
PRIMERO RESTAMOS:
[tex] \frac{3}{4} - \frac{2}{5} = \frac{(5)(3) - (4)(2)}{20} = \frac{7}{20} [/tex]
LUEGO RESTAMOS:
[tex] \frac{1}{2} - \frac{1}{5} = \frac{(5)(1) - (2)(1)}{10} = \frac{3}{10} [/tex]
AHORA RESTAMOS LAS DOS FRACCIONES
[tex] \frac{7}{20} - \frac{3}{10} = \frac{(1)(7) - (2)(3)}{20} = \frac{1}{20} [/tex]
LA RESPUESTA CORRECTA ES:
[tex] \frac{1}{20} [/tex]
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[tex] (\frac{3}{4} - \frac{2}{5} ) - ( \frac{1}{2} - \frac{1}{5} )[/tex]
PRIMERO RESTAMOS:
[tex] \frac{3}{4} - \frac{2}{5} = \frac{(5)(3) - (4)(2)}{20} = \frac{7}{20} [/tex]
LUEGO RESTAMOS:
[tex] \frac{1}{2} - \frac{1}{5} = \frac{(5)(1) - (2)(1)}{10} = \frac{3}{10} [/tex]
AHORA RESTAMOS LAS DOS FRACCIONES
[tex] \frac{7}{20} - \frac{3}{10} = \frac{(1)(7) - (2)(3)}{20} = \frac{1}{20} [/tex]
LA RESPUESTA CORRECTA ES:
[tex] \frac{1}{20} [/tex]