Hosszú keret. Matematikai feladat. Jelzőtábla. Fiatal tinilány. Ő oldja meg a feladatot az iskolatanácsban. Krétával írok a táblán.. - Stock fotó és kép

Long frame. Mathematical task. Blackboard. Young teenage girl. He solves the task standing at the school board. I write with chalk on the blackboard.

Mathematical task. Blackboard. Young teenage girl. He solves the task standing at the school board. I write with chalk on the blackboard.

Back view of schoolboy writing with chalk on blackboard

Teacher hand writing formulas on blackboard background

Close up of a hand writing on a blackboard

Schoolgirl thinks on the difficult task of mathematics on blackboard

He writes on the chalkboard with chalk. Math problem. A girl at the chalkboard.

He writes on the chalkboard with chalk. Math problem. A girl at the chalkboard.

He writes on the chalkboard with chalk. Math problem. A girl at the chalkboard. Oblong banner.

He writes on the chalkboard with chalk. Math problem. A girl at the chalkboard.

He writes on the chalkboard with chalk. Math problem. A girl at the chalkboard.

He writes on the chalkboard with chalk. Math problem. A girl at the chalkboard.

He writes on the chalkboard with chalk. Math problem. A girl at the chalkboard.