Question

Calculati:
1) 9 pe 4 +3 pe 2
2)5 pe 6 -4 pe 3
3)7 pe 6+5pe 4
4) 7 pe 4-8 pe 5
5) 2 intreg si 3 pe 8+(-13 pe 6)
6) (-7 pe 4)-1 intreg si 3 pe 14
7) (-11 pe 12)-1 intreg si 4 pe 9
8) (-2 intreg si 1 pe 8)+9 pe 10
COROANA
REPEDE!!!

Answer 1

$1) \frac{9}{4} + \frac{3}{2} = \frac{9 + 3 \times 2}{4} = \frac{15}{4}$
$2) \frac{5}{6} - \frac{4}{3} = \frac{5 - 4 \times 2}{6} = \frac{ - 3}{6} = - \frac{1}{2}$
$3) \frac{7}{6} + \frac{5}{4} = \frac{7 \times 2 + 5 \times 3}{12} = \frac{29}{12}$
$4) \frac{7}{4} - \frac{8}{5} = \frac{7 \times 5 - 8 \times 4}{20} = \frac{ 3}{20}$
$5)2 \frac{3}{8} - \frac{13}{6} = \frac{19}{8} - \frac{13}{6} = \frac{19 \times 3 - 13 \times 4}{24} = \frac{5}{24}$
$6) - \frac{7}{4} - 1 \frac{3}{14} = - \frac{7}{4} - \frac{17}{14} = \frac{ - 7 \times 14 - 17 \times 4}{56} = - \frac{166}{56} = - \frac{83}{28}$
$7) - \frac{11}{12} - 1 \frac{4}{9} = - \frac{11}{12} - \frac{13}{9} = \frac{ - 11 \times 9 - 13 \times 12}{108} = - \frac{255}{108}$
$8) - 2 \frac{1}{8} + \frac{9}{10} = - \frac{17}{8} + \frac{9}{10} = \frac{ - 17 \times 10 + 8 \times 9}{80} = - \frac{98}{80} = - \frac{49}{40}$