Question

условие в фотографии​

Answer 1

Ответ:

Объяснение:

$a_2=a_1+\frac{1}{1*2}=2+1/2=5/2;\\a_3=a_2+\frac{1}{2*3}=5/2+1/6=8/3;\\a_4=a_3+\frac{1}{3*4}=8/3+1/12=11/4;\\a_5=a_4+\frac{1}{4*5}=11/4+1/20=14/5;\\a_6=a_5+\frac{1}{5*6}=14/5+1/30=17/6;\\a_7=a_6+\frac{1}{6*7}=17/6+1/42=20/7;\\a_8=a_7+\frac{1}{7*8}=20/7+1/56=23/8;\\a_9=a_8+\frac{1}{8*9}=23/8+1/72=26/9;\\a_{10}=a_9+\frac{1}{9*10}=26/9+1/90=29/10$