Question

Упростите выражение (k+m)-(k-m)+(m-k)

Answer 1

(k+m)-(k-m)+(m-k)=k+m-k+m+m-k=3m-k

Answer 2

(k+m)-(k-m)+(m-k) = k+m-k+m+m-k = 3m - k