a: =>1/5-x=2/5:1/3=6/5
=>x=-1
b: =>3/5x=7/12
=>x=7/12:3/5=7/12*5/3=35/36
c =>3/4:x=-2-1/4=-9/4
=>x=-3/4:9/4=-3/4*4/9=-1/3
d:
=>1/5-x=2/5:1/3=6/5
=>x=-1
e: =>(x-2/3)=1/4+3/2=1/4+6/4=7/4
=>x=7/4+2/3=21/12+8/12=29/12
f: =>2x+1/2=0 hoặc 2x-3=0
=>x=3/2 hoặc x=-1/4
g: =>4x-5=0 hoặc 5/4x-2=0
=>x=2:5/4=8/5 hoặc x=5/4
h: =>(2x+1/2-1/2)(2x+1/2+1/2)=0
=>(2x+1)*2x=0
=>x=0 hoặc x=-1/2
i: =>(3x-1/2)^2=16/25
=>3x-1/2=4/5 hoặc 3x-1/2=-4/5
=>3x=4/5+1/2=8/10+5/10=13/10 hoặc3x=-8/10+5/10=-3/10
=>x=-1/10 hoặc x=13/30
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