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\(x-152:x=46\)
\(x^2\) - 152\(\) - 46\(x\) = 0
\(x^2\) - 23\(x\) - 23\(x\) + 529 - 681 = 0
\(x\)(\(x-23\)) - 23(\(x\) - 23) = 681
(\(x-23\))(\(x-23\)) = 681
\(\left[{}\begin{matrix}x-23=-\sqrt{681}\\x+23=\sqrt{681}\end{matrix}\right.\)
\(\left[{}\begin{matrix}x=23-\sqrt{681}\\23+\sqrt{681}\end{matrix}\right.\)
\(2x+3=15\\ \Rightarrow2x=15-3=12\\ \Rightarrow x=\dfrac{12}{2}=6\\ ---\\ 28-3x=13\\ \Rightarrow3x=28-13=15\\ \Rightarrow x=\dfrac{15}{3}=5\\ ---\\ \left(x-1954\right).5=50\\ \Rightarrow x-1954=50:5=10\\ \Rightarrow x=10+1954=1964\\ ---\\ x-152:2=46\\ \Rightarrow x-76=46\\ \Rightarrow x=46+76=122\)
a, 2\(x\) + 3 = 15
2\(x\) = 12
\(x\) = 6
b, 28 - 3\(x\) = 13
3\(x\) = 28 - 13
3\(x\) = 15
\(x\) = 5
\(2^{x+2}+2^{x-1}+2^{x-2}=152\)
=> \(2^x.2^2+2^x:2+2^x:2^2=152\)
=> \(2^x.2^2+2^x.\frac{1}{2}+2^x.\frac{1}{4}=152\)
=> \(2^x.(4+\frac{1}{2}+\frac{1}{4})=152\)
=> \(2^x.\frac{19}{4}=152\)
=> \(2^x=32\)
=> \(2^x=2^5\)
=> x = 5
Đặt \(2^x=t\left(t>0\right)\)
\(\Rightarrow4t+\frac{1}{2}t+\frac{1}{4}t=152\)
\(\Rightarrow t=32\Rightarrow2^x=32\Rightarrow x=5\)
2x+2 + 2x-1 + 2x-2 = 152
2x.4 + 2x.1/2 + 2x.1/4 = 152
2x.(4+1/2+1/4) = 152
2x.19/4 = 152
2x = 32 = 25
=> x = 5
Trl:
a) \(x+x+x+91=-2\)
\(\Rightarrow x.3+91=-2\)
\(\Rightarrow x.3=-2-91\)
\(\Rightarrow x.3=-93\)
\(\Rightarrow x=-93:3\)
\(\Rightarrow x=-31\)
b) \(-125-\left(3x+1\right)=-2.27\)
\(\Rightarrow-125-\left(3x+1\right)=-54\)
\(\Rightarrow\left(3x+1\right)=-125-\left(-54\right)\)
\(\Rightarrow\left(3x+1\right)=-125+54\)
\(\Rightarrow\left(3x+1\right)=-71\)
\(\Rightarrow3x=-71-1\)
\(\Rightarrow3x=-72\)
\(\Rightarrow x=-72:3\)
\(\Rightarrow x=-24\)
Hc tốt
\(x-152\div2=46\)
\(x-76=46\)
\(x=46+76\)
\(x=122\)
\(x-152:2=46\)
\(\Leftrightarrow x-76=46\)
\(\Leftrightarrow x=122\)