Question

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

a) ( x +2y ) + (5x -4)

x +2y +5x -4

6x +2y -4

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

7-8x -x-2y

7 -9-2y

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

5x-4-7+8x

13x -11

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

x+2y + 5x-4+7-8x

-2x +2y +3