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

Resposta:

a)x+2y + 5x-4

6x+2y-4

b)(7-8x) - (x+2y)

(7-8x) - (x-2y)

7-8x - x-2y

7x-7-2y

c)(5x-4) - (7-8)

(5x-4) - (7+8)

5x-4 - 7+8

5x - 11

d)(x+2y) + (5x-4) + (7-8)

6x + 2y -5