Professor falando perto de fórmulas matemáticas em quadro-negro e câmera digital borrada em sala de aula - Banco de fotos e imagens

Smiling teacher holding chalk near chalkboard with formulas and digital camera

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

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

Cheerful teacher holding chalk near chalkboard and digital camera in classroom

Teacher in eyeglasses talking near blurred digital camera and chalkboard

Positive teacher pointing at blurred chalkboard with math formulas near digital camera in school

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

Teacher holding chalk near blurred digital camera and chalkboard in class

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

Smiling teacher looking away and pointing with finger near chalkboard

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

Shocked geometry teacher touching face and pointing with finger at chalkboard with illustration

Smiling teacher looking at camera and pointing with finger near chalkboard

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

Shocked teacher touching face and pointing with finger near chalkboard

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

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