Ответ:
a) x1=-1/2; x30=8.4; x40=11.4; x100=29.4
б)x1=a; x30= a*q^29; x40= a*q^39; x100= a*q^99;
в) x1=a; x30= a+29d; x40= a+39d; x100= a+99d;
а) a1=3, a2=9, a3=81, a4=6561, a5=43046721, a6=1853020188851841
б) a1=10, a2=16, a3= 34, a4=88, a5=250, a6=736, a7=2194