Question

Resolva

A) 10-[-8(-18+6)]

B) -4+{5-[3-(-7+9)]}

C) 30-[-12-(20+30)+(12-50-2)]

D) -[7+(-3+8)-(12-20)]

Answer 1

A) 10 - [ - 8 + ( -18 + 6 ) ] =

     10 - [ - 8 + ( - 12 ) ] =

     10 - [ - 8 - 12 ] =

     10 - [ - 20 ] =

     10 + 20 = 30

só sei ESSA!!!!