q<1
значит убывающая
s4=b1/1-q
62 2/5= b1/1-1/5
312/5=b1/ 4/5
312/5=5b1/4
249.6/5=b1
49.92=b1
b2=b1*q
b2=49.92*0.2 =9. 984
S=49.92+9.984 =59.9004
ответ:59.9004
q<1
значит убывающая
s4=b1/1-q
62 2/5= b1/1-1/5
312/5=b1/ 4/5
312/5=5b1/4
249.6/5=b1
49.92=b1
b2=b1*q
b2=49.92*0.2 =9. 984
S=49.92+9.984 =59.9004
q<1
s4=b1/1-q
62 2/5= b1/1-1/5
312/5=b1/ 4/5
312/5=5b1/4
249.6/5=b1
49.92=b1
b2=b1*q
b2=49.92*0.2 =9. 984
S=49.92+9.984 =59.9004
ответ:59.9004