Task 2 - 050512

$12=3$

$123=4$

$123 \quad 4=5$

$\begin{array}{lllll}1 & 2 & 3 & 4 & 5=6\end{array}$

$\begin{array}{lllllll}1 & 2 & 3 & 4 & 5 & 6 & =7\end{array}$

$\begin{array}{lllllll}1 & 2 & 3 & 4 & 5 & 6 & 7\end{array}=8$

$123345678=9$

$123456789=10$
Insert arithmetic operators on the left side so that true statements in the form of equations are created.

(Adjacent digits can be considered as one number, but the order must not be changed. You may also use parentheses. One solution per problem is sufficient.)
Possible solutions are:

$$
\begin{aligned}
1+2 & =3 \\
12: 3 & =4 \\
(1+2) \cdot 3-4 & =5 \\
1+2 \cdot 3+4-5 & =6 \\
1+2-3-4+5+6 & =7 \\
1+2+3-4+5-6+7 & =8 \\
1 \cdot 2+3+4+5-6-7+8 & =9 \\
1 \cdot 2+3+4+5+6+7-8-9 & =10
\end{aligned}
$$