Question

8) Calcule:
a) (2x 9x+2) + (5x+3x-1)
b) (6x-4x-8) + (-2x+3x-2)
c) (2x-6y+4) + (6x+2y-2)
d) (5x-4x+7) - (9x+7x-6)
e) (6x6x+9) - (3x +8x-2)
17x-4y+2) - (2x-2y+5)​

Answer 1

Explicação passo-a-passo:

a) (2x 9x+2) + (5x+3x-1)

(11x+2) + (8x-1)

(11x+8x) + (2-1)

19x+1

b) (6x-4x-8) + (-2x+3x-2)

(2x-8) + (x-2)

(2x+x) + [(-8)-2]

3x + (-10)

c) (2x-6y+4) + (6x+2y-2)

(2x+6x+4) + (-6y+2y-2)

(8x+4) + [(-4y)-2]

(8x-4y) + (4-2)

8x-4y+2

d) (5x-4x+7) - (9x+7x-6)

(x+7) - (16x-6)

(x+16x) - (7-6)

17x-1

e) (6x6x+9) - (3x +8x-2)

(12x+9) - (11x-2)

(12x+11x) - (9-2)

23x-7

f) (17x-4y+2) - (2x-2y+5)

(17x+2x+2) - [(-4y)-2y+ 5]

(19x+2) - (-6y+5)

(19x-6y) - (2+5)

19x-6y - 7

Alguns vc deixou sem sinal, então eu deduzi que era +