Explicație pas cu pas:
a)
[tex]3 - 2 \times ( - \frac{1}{5} ) = 3 + \frac{2}{5} = \frac{15 + 2}{5} = \frac{17}{5} [/tex]
b)
[tex]5 + 3 \times ( - \frac{1}{4} ) = 5 - \frac{3}{4} = \frac{20 - 3}{4} = \frac{17}{4} [/tex]
c)
[tex] \frac{3}{2} - \frac{3}{4} \times ( - \frac{1}{2} ) = \frac{3}{2} + \frac{3}{8} = \frac{12 + 3}{8} = \frac{15}{8} [/tex]
d)
[tex] \frac{3}{4} - ( \frac{5}{2} )^{ - 2} = \frac{3}{4} - ( \frac{2}{5} )^{2} = \\ \\ \frac{3}{4} - \frac{4}{25} = \frac{75 - 16}{100} = \frac{59}{100} [/tex]
e)
[tex] \frac{5}{2} + ( \frac{1}{2} )^{ - 2} \times 0.25 = \\ \\ = \frac{5}{2} + {2}^{2} \times {2}^{ - 2} = \frac{5}{2} + 1 = \frac{5 + 2}{2} = \\ = \frac{7}{2} [/tex]
