Učitel mluví v blízkosti digitální fotoaparát a tabuli s matematickými vzorci ve třídě - Stock fotografie a obrázky

Tutor pointing at chalkboard and holding digital tablet near camera in school

Teacher in eyeglasses talking near blurred digital camera and chalkboard

Cheerful teacher holding chalk near chalkboard and digital camera in classroom

Teacher holding chalk and talking near chalkboard with formulas and digital camera

Teacher holding chalk near blurred digital camera and chalkboard in class

Teacher talking near math formulas on chalkboard and digital camera in class

Teacher talking near blurred digital camera and chalkboard with math formulas in classroom

Teacher talking near math formulas on chalkboard and blurred digital camera in classroom

Teacher in eyeglasses explaining math formulas on chalkboard near digital camera in class

Asian senior high school female teacher teach math online through camera in classroom

Smiling teacher looking away and pointing with finger near chalkboard

Shocked teacher touching face and pointing with finger near chalkboard

Laughing teacher in eyeglasses holding book while standing near chalkboard with open arm

Happy teacher smiling at camera while standing with open arm near chalkboard

Brunette doctor in white coat writing chemical formulas on glass board in lab

Smiling teacher looking at camera and pointing with finger near chalkboard

Low angle view of blurred chemist holding clipboard and felt pen near chemical formulas on glass board

Happy teacher in eyeglasses looking at camera while standing with clenched hands near chalkboard