Question

1.5 Se A= x + 2y; B= 5x – 4 e C= 7 - 8x, resolva as expressões indicadas por:
a) A + B
b) C-A
c) B-C
d) A+B+C​

Answer 1

Explicação passo-a-passo:

a)

A + B = x + 2y + 5x - 4

A + B = x + 5x + 2y - 4

A + B = 6x + 2y - 4

b)

C - A = 7 - 8x - (x + 2y)

C - A = 7 - 8x - x - 2y

C - A = -9x - 2y + 7

c)

B - C = 5x - 4 - (7 - 8x)

B - C = 5x - 4 - 7 + 8x

B - C = 5x + 8x - 4 - 7

B - C = 13x - 11

d)

A + B + C = x + 2y + 5x - 4 + 7 - 8x

A + B + C = x + 5x - 8x + 2y - 4 + 7

A + B + C = 6x - 8x + 2y + 3

A + B + C = -2x + 2y + 3