Question

me ajudem na 20 e 21 pfv

Answer 1

20-
a) 3/9 . 6/x
3x = 54
x = 54/3
x = 18

b) 2/x . 6/24
6x = 48
x = 48/6
x = 8

c) 3/5 . x/6
5x = 18
x = 18/5
x = 3,6

d) x/5 . 1/0,8
0,8x = 5
x = 5/0,8
x = 6,25

21-
a) 4/6 . 1/1 + x
4 + 4x = 6
4x = 6 - 4
4x = 2
x = 2/4
x = 0,5

b) 6/ 1 + 0,5 . 1/2
12 = 1,5 (???)
tá faltando a incógnita nesse, n entendi

c) x - 3/x . 4/5
4x = 5x - 15
4x - 5x = - 15
-x = - 15 (-1) > x = 15

d) 2x - 5/ x - 1 . 1/2
4x - 10 = x - 1
4x - x = - 1 + 10
3x = 9
x = 9/3
x = 3

beijossss