ME AJUDEM POR FAVOR!
Resolva as equações a seguir:
a) 3y/8 - 5/6 = y/3 - 5/2
b) 4x = x/2 + 17
c) m/6 + m/9 = 1/15 + m/3 - 1/6
d) 2d/7 - 1/3 = d/5
e) 3x/4 + 2/3 = x + 5/2
f) x/4 + x/3 = x - 100
g) 4/5 + 3x/4 = 1/10 + x
h) 7x/20 - 2x/5 + x/4 + 3x/20 = 1/10
i) t/2 + t/5 - 7/10 = 1 - 4t/5
j) 1/6 - x/2 = - 2x/3 + 1/4
Soluções para a tarefa
Respondido por
29
ME AJUDEM POR FAVOR!Resolva as equações a seguir:
SOMA ou SUBTRAÇÃO com FRAÇÃO faz mmc
a) 3y/8 - 5/6 = y/3 - 5/2 8,6,3,2| 2
4,3,3,2| 2
2,3,3,1| 2
3y 5 y 5 1.3.3,1| 3
------- - ------- = ----- - ----- 1,1,1,1/ = 2.2.2.3 = 24
8 6 3 2
3(3y) - 4(5) = 8(y) - 12(5)
---------------------------------------FRAÇÃO com igualdade(=) despreza
24 o denominador
3(3y) - 4(5) = 8(y) - 12(5)
9y - 20 = 8y - 60 ( isolar o (y)) atenção no sinal
9y - 20 - 8y = - 60
9y - 8y = - 60 + 20
1y = -40
y = - 40/1
y = - 40
b) 4x = x/2 + 17
x
4x = ---- + 17 mmc = 2
2
2(4x) = 1(x) + 2(17)
-------------------------- instrução acima
2
2(4x) = 1(x) + 2(17)
8x = 1x + 34
8x - 1x = 34
7x = 34
x = 34/7
6,9,15,3,6| 2
c) m/6 + m/9 = 1/15 + m/3 - 1/6 3,9,15,3,3| 3
1,3, 5, 1,1| 3
m m 1 m 1 1,1,5,1,1| 5
-- + ---- = ---- + ----- - ----- 1,1,1,1,1/ = 2.3.3.5 = 90
6 9 15 3 6
15(m) + 10(m) = 6(1) + 30(m) - 15(1) idem acima
-------------------------------------------------
90
15(m) + 10(m) = 6(1) + 30(m) - 15(1)
15m + 10m = 6 + 30m - 15
25m = 6 - 15 + 30m
25m = - 9 + 30m
25m - 30m = - 9
- 5m = - 9
m = -9/-5
m = + 9/5
d) 2d/7 - 1/3 = d/5 7,3,5| 3
7,1,5| 5
2d 1 d 7,1,1| 7
----- - ----- = ----- 1,1,1/ = 3x5x7 = 105
7 3 5
15(2d) - 35(1) = 21(d) idem acima
---------------------------
105
15(2d) - 35(1) = 21(d)
30d - 35 = 21d
30d = 21d + 35
30d - 21d = + 35
9d = 35
d = 35/9
e) 3x/4 + 2/3 = x + 5/2 4,3,2| 2
2,3,1| 2
3x 2 5 1,3,1| 3
--- + ----- = x + ------ 1,1,1/ = 2.2.3 = 12
4 3 2
3(3x) + 4(2) = 12(x) + 6(5) idem acima
--------------------------------
12
3(3x) + 4(2) = 12(x) + 6(5)
9x + 8 = 12x + 30
9x + 8 - 12x = + 30
9x - 12x = 30 - 8
- 3x = 22
x = 22 /-3
x = - 22/3
f) x/4 + x/3 = x - 100
x x
--- + ----- = x - 100 (mmc = 4x3 = 12)
4 3
3(x) + 4(x) = 12(x - 100)
-------------------------------- idem acima
12
3(x) + 4(x) = 12(x - 100)
3x + 4x = 12x - 1200
7x = 12x - 1200
7x - 12x = - 1200
- 5x = - 1200
x = - 1200/-5
x = + 1200/5
x = 240
g) 4/5 + 3x/4 = 1/10 + x
5,4,10| 2
4 3x 1 5,2, 5| 2
--- + ---- = ------ + x 5, 1 ,5| 5
5 4 10 1,1,1/ = 2.2.5 = 20
4(4) + 5(3x) = 2(1) + 20(x)
----------------------------------- idem
20
4(4) + 5(3x) = 2(1) + 20(x)
8 + 15x = 2 + 20x
8 + 15x - 20x = 2
8 - 5x = 2
- 5x = 2 - 8
- 5x = - 6
x = - 6/-5
x = + 6/5
h) 7x/20 - 2x/5 + x/4 + 3x/20 = 1/10 20,5,4,20,10|2
10,5,2,10, 5| 2
5,5,1, 5, 5| 5
7x 2x x 3x 1 1,1,1 1, 1/
--- - ------ + --- +------ = ------ = 2.2.5 = 20
20 5 4 20 10
1(7x) - 4(2x) + 5(x) + 1(3x) = 2(1) idem acima
--------------------------------------------
20
1(7x) - 4(2x) + 5(x) + 1(3x) = 2(1)
7x - 8x + 5x + 3x = 2
- 1x + 8x = 2
7x = 2
x = 2/7
i) t/2 + t/5 - 7/10 = 1 - 4t/5 2,5,10,5| 2
1,5, 5,5| 5
t t 7 4t 1, 1,1,1/ = 2x5 = 10
--- + ---- - ----- = 1 - ------
2 5 10 5
5(t) + 2(t) - 2(7) = 10(1) - 2(4t) idem acima
---------------------------------------
10
5(t) + 2(t) - 2(7) = 10(1) - 2(4t)
5t + 2t - 14 = 10 - 8t
7t - 14 = 10 - 8t
7t - 14 + 8t = 10
7t + 8t = 10 + 14
15t = 24
t = 24/15 ( diviide AMBOS por 3)
t = 8/5
j) 1/6 - x/2 = - 2x/3 + 1/4 6,2,3,4| 2
3,1,3,2| 2
1 x 2x 1 3,1,3,1| 3
---- - ----- = - ----- + ----- 1.1.1.1/ = 2.2.3 = 12
6 2 3 4
2(1) - 6(x) = - 4(2x) + 3(1) idem acima
---------------------------------
12
2(1) - 6(x) = - 4(2x) + 3(1)
2 - 6x = - 8x + 3
2 - 6x + 8x = 3
2 + 2x = 3
2x = 3 - 2
2x = 1
x = 1/2
SOMA ou SUBTRAÇÃO com FRAÇÃO faz mmc
a) 3y/8 - 5/6 = y/3 - 5/2 8,6,3,2| 2
4,3,3,2| 2
2,3,3,1| 2
3y 5 y 5 1.3.3,1| 3
------- - ------- = ----- - ----- 1,1,1,1/ = 2.2.2.3 = 24
8 6 3 2
3(3y) - 4(5) = 8(y) - 12(5)
---------------------------------------FRAÇÃO com igualdade(=) despreza
24 o denominador
3(3y) - 4(5) = 8(y) - 12(5)
9y - 20 = 8y - 60 ( isolar o (y)) atenção no sinal
9y - 20 - 8y = - 60
9y - 8y = - 60 + 20
1y = -40
y = - 40/1
y = - 40
b) 4x = x/2 + 17
x
4x = ---- + 17 mmc = 2
2
2(4x) = 1(x) + 2(17)
-------------------------- instrução acima
2
2(4x) = 1(x) + 2(17)
8x = 1x + 34
8x - 1x = 34
7x = 34
x = 34/7
6,9,15,3,6| 2
c) m/6 + m/9 = 1/15 + m/3 - 1/6 3,9,15,3,3| 3
1,3, 5, 1,1| 3
m m 1 m 1 1,1,5,1,1| 5
-- + ---- = ---- + ----- - ----- 1,1,1,1,1/ = 2.3.3.5 = 90
6 9 15 3 6
15(m) + 10(m) = 6(1) + 30(m) - 15(1) idem acima
-------------------------------------------------
90
15(m) + 10(m) = 6(1) + 30(m) - 15(1)
15m + 10m = 6 + 30m - 15
25m = 6 - 15 + 30m
25m = - 9 + 30m
25m - 30m = - 9
- 5m = - 9
m = -9/-5
m = + 9/5
d) 2d/7 - 1/3 = d/5 7,3,5| 3
7,1,5| 5
2d 1 d 7,1,1| 7
----- - ----- = ----- 1,1,1/ = 3x5x7 = 105
7 3 5
15(2d) - 35(1) = 21(d) idem acima
---------------------------
105
15(2d) - 35(1) = 21(d)
30d - 35 = 21d
30d = 21d + 35
30d - 21d = + 35
9d = 35
d = 35/9
e) 3x/4 + 2/3 = x + 5/2 4,3,2| 2
2,3,1| 2
3x 2 5 1,3,1| 3
--- + ----- = x + ------ 1,1,1/ = 2.2.3 = 12
4 3 2
3(3x) + 4(2) = 12(x) + 6(5) idem acima
--------------------------------
12
3(3x) + 4(2) = 12(x) + 6(5)
9x + 8 = 12x + 30
9x + 8 - 12x = + 30
9x - 12x = 30 - 8
- 3x = 22
x = 22 /-3
x = - 22/3
f) x/4 + x/3 = x - 100
x x
--- + ----- = x - 100 (mmc = 4x3 = 12)
4 3
3(x) + 4(x) = 12(x - 100)
-------------------------------- idem acima
12
3(x) + 4(x) = 12(x - 100)
3x + 4x = 12x - 1200
7x = 12x - 1200
7x - 12x = - 1200
- 5x = - 1200
x = - 1200/-5
x = + 1200/5
x = 240
g) 4/5 + 3x/4 = 1/10 + x
5,4,10| 2
4 3x 1 5,2, 5| 2
--- + ---- = ------ + x 5, 1 ,5| 5
5 4 10 1,1,1/ = 2.2.5 = 20
4(4) + 5(3x) = 2(1) + 20(x)
----------------------------------- idem
20
4(4) + 5(3x) = 2(1) + 20(x)
8 + 15x = 2 + 20x
8 + 15x - 20x = 2
8 - 5x = 2
- 5x = 2 - 8
- 5x = - 6
x = - 6/-5
x = + 6/5
h) 7x/20 - 2x/5 + x/4 + 3x/20 = 1/10 20,5,4,20,10|2
10,5,2,10, 5| 2
5,5,1, 5, 5| 5
7x 2x x 3x 1 1,1,1 1, 1/
--- - ------ + --- +------ = ------ = 2.2.5 = 20
20 5 4 20 10
1(7x) - 4(2x) + 5(x) + 1(3x) = 2(1) idem acima
--------------------------------------------
20
1(7x) - 4(2x) + 5(x) + 1(3x) = 2(1)
7x - 8x + 5x + 3x = 2
- 1x + 8x = 2
7x = 2
x = 2/7
i) t/2 + t/5 - 7/10 = 1 - 4t/5 2,5,10,5| 2
1,5, 5,5| 5
t t 7 4t 1, 1,1,1/ = 2x5 = 10
--- + ---- - ----- = 1 - ------
2 5 10 5
5(t) + 2(t) - 2(7) = 10(1) - 2(4t) idem acima
---------------------------------------
10
5(t) + 2(t) - 2(7) = 10(1) - 2(4t)
5t + 2t - 14 = 10 - 8t
7t - 14 = 10 - 8t
7t - 14 + 8t = 10
7t + 8t = 10 + 14
15t = 24
t = 24/15 ( diviide AMBOS por 3)
t = 8/5
j) 1/6 - x/2 = - 2x/3 + 1/4 6,2,3,4| 2
3,1,3,2| 2
1 x 2x 1 3,1,3,1| 3
---- - ----- = - ----- + ----- 1.1.1.1/ = 2.2.3 = 12
6 2 3 4
2(1) - 6(x) = - 4(2x) + 3(1) idem acima
---------------------------------
12
2(1) - 6(x) = - 4(2x) + 3(1)
2 - 6x = - 8x + 3
2 - 6x + 8x = 3
2 + 2x = 3
2x = 3 - 2
2x = 1
x = 1/2
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