Question

6и 7 как будет вем пж

Answer 1

6. S14= (2a1+13d)/2•14=(-14+14,3)/2•14=2,1

7. 8a 64a^2+c^2 c–64
----- – --------------- + --------- =
c 8ac 8a

64a^2–64a^2–c^2+c^2–64c
= ----------------------------------------- =
8ac

64c 8 8
= – ------ = – ----- = – ----
8ac a 17