Question

sper să fie bine mulțumesc ​

Answer 1

Răspuns:

Salutare!

Exercitiul 1:

a) 2

b) -2

e) 4

f) -7

i) -19

j) -24

m) 38

n) 35

Exercitiul 2:

a) $\frac{9}{4}+\frac{3}{2}= \frac{9+6}{4} =\frac{15}{4}$

b) $\frac{5}{6} - \frac{4}{3} = \frac{5-8}{6} = \frac{-3}{6} =-\frac{1}{2}$

e)2$\frac{3}{8} + (\frac{-13}{6} )= \frac{19}{8} - \frac{13}{6} =\frac{5}{24}$

f) $(-\frac{7}{4})- 1\frac{3}{14}= -\frac{7}{4} - \frac{17}{14} = \frac{-83}{28}$

Answer 2

1. Calculati:

a) (-3) + 5 = - 3 + 5 = 2

b) 7 + (-9) = 7 - 9 = -2

e) 21 + (-17) = 21 - 17 = 4

f) (-19) + 12 = 12 - 19 = -7

i) (-7) - 12 = (-7) + (-12) = -19

j) (-6) - 18 = (-6) + (-18) = -24

m) 18 - (-20) = 18 + 20 = 38

n) 14 - (-21) = 14 + 21 = 35

2. Calculati:

$a) \quad \dfrac{9}{4}+\dfrac{3}{2}= \dfrac{9+3 \cdot 2}{4}= \red{\boxed{ \dfrac{15}{4}}}$

$b) \quad \dfrac{5}{6}-\dfrac{4}{3}=\dfrac{5-4\cdot 2}{6}=\dfrac{-3}{6}=\red {\boxed{-\dfrac{1}{2}}}$

$e) \quad 2\dfrac{3}{8} +\Big(-\dfrac{13}{6}\Big)= \dfrac{2 \cdot 8 +3}{8}-\dfrac{13}{6}=\dfrac{19}{8}-\dfrac{13}{6} \\ = \quad \dfrac{19 \cdot 3-13 \cdot 4}{24}=\dfrac{57-52}{24}=\red{\boxed{ \dfrac{5}{24}}}$

$f)\quad \Big( -\dfrac{7}{4}\Big)-1\dfrac{3}{14} = -\dfrac{7}{4}-\dfrac{1\cdot 14+3}{14}=-\dfrac{7}{4}-\dfrac{17}{14}\\= \quad -\dfrac{7 \cdot 7}{28}- \dfrac{17 \cdot 2}{28}=\dfrac{-49-34}{28}=\red {\boxed{-\dfrac{83}{28}}}$