Question

Tìm x 

x - 4/5 = 3/7

x + 3/7 = 4/5

19/20 - x = 8/5 - 3/4

4/5 x X = 6/9 - 4/7

x : 7/9 = 6/8

2/3 - x/6 = 6/18

Answer 1

a: x-4/5=3/7

=>x=3/7+4/5=43/35

b: x+3/7=4/5

=>x=4/5-3/7=13/35

c: 19/20-x=8/5-3/4

=>19/20-x=32/20-15/20=17/20

=>x=2/20=1/10

d: =>4/5*x=11/21

=>x=55/84

e: =>x=6/8*7/9=42/72=7/12

f: =>x/6=2/3-1/3=1/3

=>x=2