Bài 3:
a: x=3/4-1/2=3/4-2/4=1/4
b: =>x=-2/3-1=-5/3
c: =>x-1/2=-2/5
=>x=-2/5+1/2=-4/10+5/10=1/10
d: =>3/4:x=5/2-1/4=9/4
=>x=3/4:9/4=3
e: =>x+1/4=-5/8:3/4=-5/8*4/3=-20/24=-5/6
=>x=-5/6-1/4=-10/12-3/12=-13/12
f: =>x=-2/3*24=-16
i: =>(x+3)^2=64
=>x+3=8 hoặc x+3=-8
=>x=-11 hoặc x=5