Question

Rezultatul calculului 5/8 *  (-2) + 2,5 este :

A. -15/4   B. 5/4     C.-5/16     D.-5/4              EXPLICATI!!!!

Answer 1

$\frac{5}{8} * (-2) + 2 \frac{5}{10}=- \frac{5}{4} + 2 \frac{1}{2} = \\ \\ = -\frac{5}{4} + \frac{5}{2} = -\frac{5}{4} + \frac{10}{4} = \\ \\ = \boxed{ \frac{5}{4}= 1,25}$

Answer 2

[tex]\displaystyle \frac{5}{8} \cdot (-2)+2,5=\\ =- \frac{5}{4}+ \frac{25}{10}^{(5}=\\ =- \frac{5}{4}+ ^{2)}\frac{5}{2}=\\ =- \frac{5}{4}+ \frac{10}{4}=\\ = \frac{5}{4} [/tex]