Matemātikas formulas
Fizikas formulas
Meklet
Aprēķini
9F99We - 1
Aprēķins: 9F99We - 1
S
_
n
=
(
a
_
1
+
a
_
n
)
*
n
/
2
S
_
n
=
(
a
_
1
+
a
_
n
)
*
n
/
2
$$S_{n}$$
=
$$\frac{(a_{1}+a_{n})\cdot n}{2}$$
S
_
n
=
a
_
1
*
n
/
2
+
a
_
n
*
n
/
2
$$S_{n}$$
=
$$\frac{a_{1}\cdot n}{2}+\frac{a_{n}\cdot n}{2}$$
S
_
n
=
0.5
*
a
_
1
*
n
+
0.5
*
a
_
n
*
n
$$S_{n}$$
=
$$0.5\cdot a_{1}\cdot n+0.5\cdot a_{n}\cdot n$$