5^2x-3-2.5^2=5^2.3
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\(5^{2x-3}-2\cdot5^2=5^2\cdot3\)
\(\Rightarrow5^{2x-3}-50=75\)
\(\Rightarrow5^{2x-3}=75+50\)
\(\Rightarrow5^{2x-3}=125\)
\(\Rightarrow5^{2x-3}=5^3\)
\(\Rightarrow2x-3=3\)
\(\Rightarrow2x=6\)
\(\Rightarrow x=\dfrac{6}{2}=3\)
25x-3-2.25=25.3
25x-3-50=75
25x-53=75
25x=75+53
25x=128
x=128
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25
25x-3-2.25=25.3
25x-3-50=75
25x-53=75
25x=75+53
25x=128
x=128
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25
5^(2x-3) = 5^2.3 + 2.5^2
5^(2x-3) = 5^2( 3 + 2)
5^(2x-3) = 5^2.5
5^(2x-3) = 5^3
2x - 3 =3
2x = 6
x = 3
=> 5^2x-3 = 5^2.3 + 5^2.2 = 5^2.(2+3) = 5^2.5 = 5^3
=> 2x-3 = 3
=> 2x = 3+3 = 6
=> x = 6:2 = 3
Vậy x = 3
Tk mk nha
52x - 3 - 2.52 = 52.3
52x-3 = 52.3 + 2.52
52x - 3 = 53
2x- 3 = 3
2x = 6
x = 3
\(5^{2x-3}-2.5^2=5^2.3\)
\(\Rightarrow5^{2x-3}=5^2.3+5^2.2\)
\(\Rightarrow5^{2x-3}=5^2.\left(2+3\right)=5^3\)
\(\Rightarrow2x-3=3\)
\(\Rightarrow2x=6\)
\(\Rightarrow x=3\)
\(5^{2x-3}\)-2.\(5^2\)= \(5^2\).3
\(5^{2x-3}\) _2.25=25.3
\(5^{2x-3_{ }}\)_50=75
\(5^{2x-3}\)= 75_50
\(5^{2x-3}\)= \(5^2\)
suy ra : 2x-3=2
2x=2.3
2x=6
x=6:2
x=3
\(5^{2x-3}-2.5^2=5^2.3\)
\(5^{2x-3}=2.5^2+5^2.3\)
\(2x-3=3\)
\(2x=3+3\)
\(2x=6\)
\(x=6:2=3\)
\(\Rightarrow x=3\)