Question

Answer 1

Bài 1.10

a) 0,16/x = 0,32/8

x.0,32 = 0,16.8

x.0,32 = 1,28

x = 1,28 : 0,32

x = 4

b) x/3 = -9/27

x.27 = -9.3

x.27 = -27

x = -1

c) -25/(-2) = 50/x

x.(-25) = 50.(-2)

x.(-25) = -100

x = -100 : (-25)

x = 4

d) 7/(-49) = x/(-28)

x.(-49) = -28.7

x.(-49) = -196

x = -196 : (-49)

x = 4

Answer 2

Bài 1.11

a) 14/15 : 9/10 = x : 3/7

x : 3/7 = 28/27

x = 28/27 . 3/7

x = 4/9

b) (1 3/5) : 8 = 2,5 : x

2,5 : x = 8/5 : 8

5/2 : x = 1/5

x = 5/2 : 1/5

x = 25/2

c) (-1/5) : (1 2/3) = -2/7 : x

-2/7 : x = -1/5 : 5/3

-2/7 : x = -3/25

x = -2/7 : (-3/25)

x = 50/21

d) 1/2 : 2/3 = x : 1/9

x : 1/9 = 3/4

x = 3/4 . 1/9

x = 1/12