\(a,5^{2x-3}-2.5^2=5^2.3\)
\(5^{2x-3}-2.5^2=25.3\)
\(5^{2x-3}-2.25=75\)
\(5^{2x-3}-50=75\)
\(5^{2x-3}=75+50\)
\(5^{2x-3}=125\)
\(5^{2x-3}=5^3\)
\(5^{2x}=5^{3+3}\)
\(5^{2x}=5^6\)
\(x=6\div2\)
\(x=3\)
a,52x−3−2.52=52.3a,52x−3−2.52=52.3
52x−3−2.52=25.352x−3−2.52=25.3
52x−3−2.25=7552x−3−2.25=75
52x−3−50=7552x−3−50=75
52x−3=75+5052x−3=75+50
52x−3=12552x−3=125
52x−3=5352x−3=53
52x=53+352x=53+3
52x=5652x=56
x=6÷2x=6÷2
x=3
52x-3- 2 . 52= 52. 3
52x - 3- 2 . 52= 25 . 3 = 75
2 . 52= 2 . 25 = 50
52x - 3= 75 - 50 = 25
vì 25 = 52 vậy 52x - 3= 52
suy ra 2x - 3 = 2
2x = 2 + 3 = 5
x = 5 : 2 = 2,5
