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ta có : 4^2x-3 + 7.4^3=4^3.23
4^2x-3+448 =1472
4^2x-3 =1024
4^2x-3 = 4^5
2x-3 = 5
2x = 8
x =4
đúng thì mình 1 cái
a,2x+53=135
2x=135-53
2x=82
x=82:2
x=41
bạn viết khó hỉu quá nên mk giúp bạn dc câu a thui
k hộ mk với
a) \(5\left(x+7\right)-10=2^3\cdot5\)
\(\Rightarrow5\left(x+7\right)-10=40\)
\(\Rightarrow5\left(x+7\right)=40+10\)
\(\Rightarrow x+7=\dfrac{50}{5}\)
\(\Rightarrow x+7=10\)
\(\Rightarrow x=10-7\)
\(\Rightarrow x=3\)
b) \(9x-2\cdot3^2=3^4\)
\(\Rightarrow9x-18=81\)
\(\Rightarrow9x=81+18\)
\(\Rightarrow9x=99\)
\(\Rightarrow x=\dfrac{99}{9}\)
\(\Rightarrow x=11\)
c) \(5^{25}\cdot5^{x-1}=5^{25}\)
\(\Rightarrow5^{x-1}=5^{25}:5^{25}\)
\(\Rightarrow5^{x-1}=1\)
\(\Rightarrow5^{x-1}=5^0\)
\(\Rightarrow x-1=0\)
\(\Rightarrow x=1\)
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a) \(4^{2x}-3+7.4^3=4^3.23\)
\(4^{2x-3}+7.64=64.23\)
\(4^{2x-3}+448=1472\)
\(4^{2x-3}=1472-448\)
\(4^{2x-3}=1024\)
\(2x-3=1024:4\)
\(2x-3=256\)
\(2x=256+3\)
\(2x=259\)
\(\Rightarrow x=129,5\)
Đề bài sai thì phải bạn ạ !