Question

Determine valor de x nas proporções 9/13=x/26


2x+1/10=7/10


×+7/×+5=3/4


3×+4/5=×-2/4


3x+2=/x+3=8/5

Answer 1

9/13 = x/26
234 = 13x
x = 234/13
x=18

2x + 1/10 = 7/10
2x + 1 = 7
2x = 7 - 1
2x = 6
x = 3

x + 7/x + 5 = 3/4
4(x + 7) = 3(x + 5)
4x + 28 = 3x + 15
4x - 3x = 15 - 28
x = -13

3x + 4/5 = x - 2/4
3x + 4/5 = x - 1/2
3x - x = -1/2 -4/5
2x = -13/10
x = -13/20

3x + 2/x + 3 = 8/5
5(3x + 2) = 8(x + 3)
15x + 10 = 8x + 24
15x - 8x = 24 - 10
7x = 14
x = 14/7
x = 2