Tìm tất cả các hàm số f: Z-->Z thỏa: f( f(x)+f(y) ) = x+y+1, với mọi x,y thuộc Z
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Answer:
- 508
Step-by-step explanation:
The n th term of an arithmetic sequence is
= a₁ + (n - 1)d
where a₁ is the first term and d the common difference
Here a₁ = - 28 and d = - 34 - (- 28) = - 34 + 28 = - 6, thus
= - 28 + (- 6 × 80) = - 28 - 480 = - 508