Usando a propriedade fundamental, calcule x nas proporções:
a) 1\3x= 2\x+1
b) 2x-5\7x = 3\10
c) x – 5\ x – 3 =3\5
d) 7\ 2x - 1 = 5\ 2x + 1
a) 1\3x= 2\x+1
b) 2x-5\7x = 3\10
c) x – 5\ x – 3 =3\5
d) 7\ 2x - 1 = 5\ 2x + 1
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(x+1)*1 = 3x*2
x+1 = 6x
6x-x = 1
5x = 1
x =
b)
7x*3 = (2x-5)*10
21x = 20x-50
21x-20x=50
x=-50
c)
5*(x-5) = 3*(x-3)
5x-25 = 3x-9
5x-3x=-9+25
2x = 16
x = 16/2 => x=8
d)
7*(2x+1) = 5*(2x-1)
14x+7=10x-5
14x-10x = -5-7
4x = -2
x = -2/4 => x=