vikaxkad

Verified answer

d= 7-4=3 або 10-7=3!!!!!

Universalka

[tex]\displaystyle\bf\\a_{1} =4\\\\a_{2} =7\\\\\\a_{2}=a_{1}+d\\\\d=a_{2} - a_{1}=7-4=3\\\\Otvet \ : \ d=3[/tex]