Question

efetue os cálculos:
a)10y+5y=
b)18x-3x-4x=
c)5x.(-4x)=

Answer 1

a)
10y + 5y = 15y

b)
18x - 3x - 4x = 18x - 7x = 11x

c)
5x.(-4x) = - 20x²