Question

Resuelve las siguientes expresiones

1:-2.1-(3.5+2.1)+(5+3.5)=

2:-[20-(8-3)]-(9-4)

3:-3+0.5×2+4

4:-[(3+4)x5]-5+2×5

alguien me ayuda

Answer 1

1) 2.1-(3.5+2.1)+(5+3.5)
     2.1-(5.6)+(8.5)
     2.1-5.6+8.5 = - 3.5+8.5 = 5.0 = 5

2) [20-(8-3)]-(9-4)
     [20-(5)]-(5)
    [15]-(5) = 15 - 5 = 10

3)  3+0.5×2+4
      3+1+4 = 8

4) [(3+4)x5]-5+2×5
    [(7)x5]-5+10
    [35]-5+10
   30+10 = 40