Question

4/x=1/5

Answer 1

suy ra 4x5=x*1

          20 =x*1

       20:1 =x

        20=x

vay x=20

Answer 2

4/x=1/5

4/x=4/20

=> x=20 

Answer 3

x cần tìm là :

5 x 4 = 20

Đáp số : 20

Answer 4

x=4*5:1=20

Answer 5

Vì 4/x = 1/5 nên 4/x = 4/20

=) x=20

k mình nhé

Answer 6

4/x=1/5=>4/x=4/20=>x=20

vay x=20

Answer 7

4/20 =1/5

Answer 8

x= 4* 5/1=20

   đs : 20