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\(42-2\left(32-2^{x+1}\right)=10\)
\(\Leftrightarrow2\left(32-2^{x+1}\right)=42-10=32\)
\(\Leftrightarrow32-2^{x+1}=16\)
\(\Leftrightarrow2^{x+1}=32-16=16\)
\(\Leftrightarrow2^{x+1}=2^4\)
\(\Leftrightarrow x+1=4\)
\(\Rightarrow x=3\)
\(42-2\left(32-2^{x+1}\right)=10\)
\(\Leftrightarrow2^{x+1}=16\)
\(\Leftrightarrow2^{x+1}=2^4\)
=> x = 4
\(42-2.\left(32-2^{x+1}\right)=10\)
\(2.\left(32-2^{x+1}\right)=42-10\)
\(2.\left(32-2^{x+1}\right)=32\)
\(32-2^{x+1}=32:2\)
\(32-2^{x+1}=16\)
\(2^{x+1}=32-16\)
\(2^{x+1}=16\)
\(2^{x+1}=2^4\)
\(x+1=4\)
\(x=4-1\)
\(x=3\)
a: \(2x+3x=5^7:5\)
=>\(5x=5^7:5=5^6\)
=>\(x=5^6:5=5^5\)
b: \(7\left(42-x\right)=5^3+134\)
=>7(42-x)=125+134=259
=>42-x=37
=>x=42-37=5
c: \(x+18:3^2=5\cdot4^2\)
=>\(x+\frac{18}{9}=5\cdot16\)
=>x+2=80
=>x=80-2
=>x=78
\(\frac{7}{x}=\frac{y}{81}=-\frac{42}{54}\)
\(+,\frac{7}{x}=-\frac{42}{54}\Rightarrow378=-42x\Rightarrow x=-9\)
\(+,\frac{y}{81}=-\frac{42}{54}\Rightarrow54y=-3402\Rightarrow y=-63\)
a) B (13) = { 13 ; 26 ; 39 ; 52 ;......}
mà 0 < x < 42
=>x={13; 26 ; 39 }
Ư(72)={1;2;3;4;6;8;9;12;18;24;36;72}
mà x > 9
=> x={12;18;24;36;72}
\(32x-42=-10x+42\)
\(\Leftrightarrow32x+10x=42+42\)
\(\Leftrightarrow42x=84\)
\(\Leftrightarrow x=2\)