Question

Упростите выражение: 1) 79-(20+9а)+(11а-122);2)+(б+40)+(28-19б)+11б.

Answer 1

1) 79-(20+9a)+(11a-122)=79-20-9a+11a-122=-181+2a
2) (b+40)+(28-19b)+11b=b+40+28-19b+11b=-7b+78