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MarianeSouza123
@MarianeSouza123
December 2019
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Resolva as equações:
1)x-3x-8=5.(-2)+3x
2)3x-2 (sobre 4) - 4-x (sobre 2) = 2x- 7x-2 (sobre 3)
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bárbaradalri
X - 3x - 8 = 5(-2) + 3x (1)
-2x - 8 = -10 + 3x
-2x - 3x = -10 + 8
-5x = -2
x = -2
----
-5
x = 0,4
3x - 2 4 - x 2x - 7x - 2 (2)
-------- - ------- = --------------
4 2 3
3x - 2 4 - x -5x - 2
-------- - ------- = --------- (tiraremos o M.M.C, que é 12)
4 2 3
9x - 6 24 - 6x -20x - 8
-------- - ------- = ----------- (podemos cortar os denominadores)
12 12 12
9x - 6 - 24 - 6x = -20x - 8
9x - 6x + 20x = -8 + 24 + 6
23x = 22
x = 22
----
23
x = 0,95
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-2x - 8 = -10 + 3x
-2x - 3x = -10 + 8
-5x = -2
x = -2
----
-5
x = 0,4
3x - 2 4 - x 2x - 7x - 2 (2)
-------- - ------- = --------------
4 2 3
3x - 2 4 - x -5x - 2
-------- - ------- = --------- (tiraremos o M.M.C, que é 12)
4 2 3
9x - 6 24 - 6x -20x - 8
-------- - ------- = ----------- (podemos cortar os denominadores)
12 12 12
9x - 6 - 24 - 6x = -20x - 8
9x - 6x + 20x = -8 + 24 + 6
23x = 22
x = 22
----
23
x = 0,95