Question

test de evaluare stadială​

Answer 1

Răspuns:

a)  $\frac{36}{15}$

b)  $\frac{17}{12}$

c)  $-\frac{71}{40}$

Explicație pas cu pas:

a)

$1\frac{2}{3} + \frac{11}{15} = \frac{5}{3} +\frac{11}{15} = \frac{5*5 + 11}{15} = \frac{25+11}{15} = \frac{36}{15}$

b)

$2\frac{1}{4} + (-\frac{5}{6} ) = \frac{9}{4} - \frac{5}{6} = \frac{9*3-5*2}{12} = \frac{27-10}{12} = \frac{17}{12}$

c)

$(-\frac{3}{8} ) + (-1\frac{2}{5} ) = -\frac{3}{8} - \frac{7}{5} = \frac{-3*5 - 7*8}{40} = \frac{-15-56}{40} = -\frac{71}{40}$