1д=х
2д=2х
3д=2х+60
1,2,3д=1275
х+2х+2х+60=1275
5х=1215
х=243
ответ:1д=243
2д=486
3д=546
2,25^1/7*4^1/7*4^1/7*36^6/7=(2?25*4*4)^1/7*36^6/7=36^1/7*36^6/7=36^7/7=36