Respuesta:7
Explicación paso a paso:First, simplify the expression inside the curly brackets:
−
15
+
9
−
1
−15+9−1
Calculate the result of
−
15
+
9
−
1
−15+9−1:
−
15
+
9
=
−
6
−15+9=−6
−
6
−
1
=
−
7
−6−1=−7
So, the expression inside the curly brackets is
−
7
−7.
Now, substitute
−
7
−7 back into the original expression:
−
{
−
5
+
(
−
7
)
}
+
2
−
2
−
5
−{−5+(−7)}+2−2−5
Simplify inside the curly brackets:
−
5
+
(
−
7
)
=
−
5
−
7
=
−
12
−5+(−7)=−5−7=−12
Now, substitute
−
12
−12 back into the expression:
−
{
−
12
}
+
2
−
2
−
5
−{−12}+2−2−5
The negative sign outside the curly brackets will change the sign of
−
12
−12:
12
+
2
−
2
−
5
12+2−2−5
Now, perform the addition and subtraction from left to right:
12
+
2
=
14
12+2=14
14
−
2
=
12
14−2=12
12
−
5
=
7
12−5=7
Therefore, the value of the given expression is:
7