Răspuns:
a) [tex]\frac{3}{7}[/tex]
b) [tex]-\frac{74}{3}[/tex]
c) 3
d) [tex]\frac{1}{6}[/tex]
e) [tex]\frac{3}{10}[/tex]
f) [tex]\frac{7}{12}[/tex]
g) [tex]\frac{7}{6}[/tex]
h) 3
i) 1,5
Explicație pas cu pas:
a)
[tex]-\frac{2}{7}- (-\frac{5}{7})=\\\frac{-2+5}{7} =\frac{3}{7}\\[/tex]
b)
[tex]-\frac{4}{3}-(+\frac{70}{3} )=\frac{-4-70}{3} =-\frac{74}{3}[/tex]
c)
[tex]\frac{9}{4} -(-\frac{3}{4} )=\frac{9+3}{4} =\frac{12}{4} =3\\[/tex]
d)
[tex]\frac{1}{3}-(+\frac{1}{6} )=\frac{1}{3}-\frac{1}{6} = \frac{1}{3} *\frac{2}{2} -\frac{1}{6} =\frac{2-1}{6} =\frac{1}{6}[/tex]
e)
[tex]-\frac{2}{5} -(-\frac{7}{10} )=-\frac{2}{5} *\frac{2}{2} +\frac{7}{10} =\frac{-4+7}{10}=\frac{3}{10}[/tex]
f)
[tex]\frac{5}{12} =(-\frac{1}{6} )=\frac{5}{12} +\frac{1}{6} *\frac{2}{2} =\frac{5+2}{12} =\frac{7}{12}[/tex]
g)
[tex]-\frac{1}{24} -(+\frac{9}{8} )=-\frac{1}{24} -\frac{9}{8} *\frac{3}{3} =\frac{-1-27}{24} =-\frac{28}{24}[/tex] simplificam cu 4 si ne da [tex]\frac{7}{6}[/tex]
h) 4,5-(4,5-3)=4,5-1,5=3
i) -7,7-(-2,8)-9=-7,7+2,8-9=10,5-9=1,5
Sper ca te-am ajutat!
