Question

efetue e expresse o resultado na forma de fracao irredutivel:

a) 1/4 * 0,5 + 1/2 =

b) ( 2,5 + 1/3)* 0,75=

ME AJUDEM

Answer 1

$a)\ \frac{1}{4} \cdot0,5+ \frac{1}{2} = \frac{1}{4} \cdot\frac{5}{10} + \frac{1}{2} =\frac{5}{40}+\frac{1}{2} =\frac{5}{40}+\frac{20}{40}=\frac{5+20}{40}=\frac{25^{:5}}{40_{:5}} = \frac{5}{8}$

$b)\ (2,5+ \frac{1}{3} ) \cdot0,75=( \frac{25}{10} + \frac{1}{3} ) \cdot \frac{75}{100} =( \frac{75}{30}+ \frac{10}{30} ) \cdot \frac{75}{100} = \frac{75+10}{30} \cdot \frac{75}{100} \\ \\ =\frac{85^{:5}}{30_{:5}} \cdot \frac{75^{:25}}{100_{:25}} = \frac{17}{6} \cdot \frac{3}{4}= \frac{51^{:3}}{24_{:3}} = \frac{17}{8}$