Question

7) Reduza os termos semelhantes, eliminando os parênteses:

a) b – (15b – 18b) =

b) 12x²y – (- 4x²y) + (- x²y) =

c) 4x + (- 5x) – (+ 7x)=
​

Answer 1

Resposta:

a) b – (15b – 18b) =

$b - 15b + 18b \\ - 14b + 18b \\ 4b$

b) 12x²y – (- 4x²y) + (- x²y) =

${12x}^{2}y + {4x}^{2}y - {x}^{2}y \\ 16 {x}^{2}y - {x}^{2}y \\ 15 {x}^{2}y$

c) 4x + (- 5x) – (+ 7x)=

$4x - 5x - 7x \\ - x - 7x \\ - 8x$