Piccola espressioncina algebrica

[giuly123]

{[(7/15 + 3/20 - 1/4) - (- 1/3 + 11/10 - 3/4) + 5/3 ] - 2} - 1/5 risultato= - 1/20


-(11/18 - 2/3) +{ 1/9-[5/3+(11/3 - 13/9 - 1/2)]} + 28/9 risultato = - 1/9

[enrico___1]

[math]
\{[\frac{11}{30}-\frac{1}{60}+\frac{5}{3}]-2\}-\frac{1}{5}
[/math]

[math]
[(\frac{11}{30}-\frac{1}{60}+\frac{5}{3})-2]-\frac{1}{5}
[/math]

[math]
\frac{1}{60}-\frac{1}{5}
[/math]

[math]
-\frac{11}{60}
[/math]

[math]
\frac{1}{18} +\{ \frac{1}{9}-[\frac{5}{3}+(\frac{31}{18})]\} + \frac{28}{9}
[/math]

[math]
\frac{1}{18} -\frac{59}{18} + \frac{28}{9}
[/math]

[math]
-\frac{1}{9}
[/math]

[coltina]

{[(28/60 + 9/60 - 15/60)-(- 20/60+ 66/60-45/60) + 5/3]-2}-1/5=
{[ 22/60 - 1/60 + 5/3]-2}- 1/5=
{[21/60 + 100/60] -2} -1/5=
{121/60 -120/60} -1/5=
1/60 - 1/5=
1/60 - 12/60=
-11/60 CONFERMO!