`a)(x-1/5)^2=4/25`
`=>(x-1/5)^2=(2/5)^2` hoặc `(x-1/5)^2=(-2/5)^2`
`@TH1:x-1/5=2/5=>x=2/5+1/5=3/5`
`@TH2:x-1/5=-2/5=>x=-2/5+1/5=-1/5`
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`b)|x-1/5|=4/25`
`@TH1:x-1/5=4/25=>x=4/25+1/5=9/25`
`@TH2:x-1/5=-4/25=>x=-4/25+1/5=1/25`
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`c)5^x+5^[x+1]=150`
`=>5^x+5^{x}.5^1=150`
`=>5^x (1+5)=150`
`=>5^x .6=150`
`=>5^{x}=25`
`=>5^{x}=5^2`
`=>x=2`
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