j)
MMC (5,4,10) = 20
(
30) Sendo U = Q, resolva as equações:
)
a) 3x – 9 = 9 3x = 18 x = 6 b) x – 5 = -7 x = -7 + 5 x = -2 c) y – 6 = 5y + 8 y – 5y = 8 + 6 - 4y = 14 (-1)
k)
MMC (2,4) = 4
4y = -14
d) 10x = 20 + 9x 10x – 9x = 20 x = 20 e) 5 – x – 20 = 5x – 10 – 7x - x – 5x + 7x = -10 + 20 - 5 x=5
l)
MMC (5,3) = 15
(
)
(
)
f) 2(x + 3) = 30 2x + 6 = 30 2x = 24 x = 12 (-1) g) 8 – 2(x + 5) = 5 + 3(2x + 4) 8 – 2x – 10 = 5 + 6x + 12 - 2x – 2 = 17 + 6x - 2x – 6x = 17 + 2 - 8x = 19 (-1) 8x = -19 x = -19/8
x = -14
m)
(
)
)
MMC (3,6,8) = 24
h) 3(2x + 4) = 4(x + 6) 6x + 12 = 4x + 24 6x – 4x = 24 – 12 2x = 12 x = 6 i) 4x – 10(x + 1) – 2(x – 2) = 0 4x – 10x – 10 -2x + 4 = 0 - 8x – 6 = 0 - 8x = 6 (-1) 8x = -6
(
n)
(
)
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