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A) X/5 = 21/35
B) 10/7 = 50/X
C) 1/7 = X - 6 /49
D)5X + 3/10 = -21/30
E)5/ X + 4 = 30/54
F)0,9/x = -18/27
G)7X + 5 / 4 = 2X/ 3/4
H) 3X+4/ 4X = 1/3/1/4
Soluções para a tarefa
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A) x 21
--- = ------
5 35
múltiplica cruzado:
35x= 105
x = 105
-------
35
×= 3
B) 10/7 =50/ x
10 x = 350
x = 350/10
×= 35
C) 1 x-6
-- = ------
7 49
7x - 42 = 49
7x= 49 +42
7x= 91
x = 91/7
x= 13
D) 5x + 3/10 = -21/30
150x 90 = - 210
150x = -210 - 90
150x= -300
x = -300/150
x = -2
E) 5/ x+4 = 30/54
30x + 120 = 270
30x= 270 -120
30x= 150
x=150/30
x= 5
F)0,9 / x = -18/27
-18x= 24,3 ( -1)
18x = -24,3
x = -24,3 / 18
x= - 1,35
--- = ------
5 35
múltiplica cruzado:
35x= 105
x = 105
-------
35
×= 3
B) 10/7 =50/ x
10 x = 350
x = 350/10
×= 35
C) 1 x-6
-- = ------
7 49
7x - 42 = 49
7x= 49 +42
7x= 91
x = 91/7
x= 13
D) 5x + 3/10 = -21/30
150x 90 = - 210
150x = -210 - 90
150x= -300
x = -300/150
x = -2
E) 5/ x+4 = 30/54
30x + 120 = 270
30x= 270 -120
30x= 150
x=150/30
x= 5
F)0,9 / x = -18/27
-18x= 24,3 ( -1)
18x = -24,3
x = -24,3 / 18
x= - 1,35
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