d=7
Пошаговое объяснение:
a1+a1+4d=24
(a1+d)(a1+2d)=60
2a1+4d=24
a1+2d=12
a1= 12-2d
(12-2d+d)(12-2d+2d)=60
(12-d)*12=60
12-d=5
d=7
Пошаговое объяснение:
a1+a1+4d=24
(a1+d)(a1+2d)=60
2a1+4d=24
(a1+d)(a1+2d)=60
a1+2d=12
a1= 12-2d
(12-2d+d)(12-2d+2d)=60
(12-d)*12=60
12-d=5
d=7