$$\sum_{k=0}^{n}{4^{-k}}$$
3(q-4)+6(q-5)
120 169
297425
1868142
1473275
493417
3736284
2946550
16312218
21022198
9915932
7585839
7160984
120
91
ax=b/cx=d
-3 + 4 + ( -3 )
y=-5x+1/3
0,50 x 0,01
estimate the quotients of 359/89
