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a) 32.x+2=1342176728
32.x=134217728-2
32.x=134217726
x=134217726:32
x=4194303,938
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a) (2x)5 : 43 = 815 => 25x = 815.43 = (23)15.(22)3 = 245.26 = 251 => 5x = 51 => x = 10,2
b) (32)x .93 = 2439 => 32x = 2439 : 93 = (35)9 : (32)3 = 345 : 36 = 339 => 2x = 39 => x = 19,5
c) (1/125)3.5x = 255 => 5x = 255 : (1/125)3 = (52)5 : (1/53)3 = 510 : (5-3)3 = 510 : 5-9 = 519 => x = 19
d) 1/81 : 3x = 1/729 => 3x = 1/81 : 1/729 = 1/34.729 = 3-4.36 = 32 => x = 2
e) (5x - 2)4 = 168 = (162)4 = 2564
=> 5x - 2 = -256 ; 256 => 5x = -254 ; 258 => x = -50,8 ; 51,6
P/S : Thay x = 10,2 vào câu a , x = 19,5 vào câu b sẽ thấy điều hư cấu : 210,2 và 919,5.Ko thể tính được giá trị của 2 lũy thừa này.
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1: x=3/4-1/2=3/4-2/4=1/4
2: x-1/5=2/11
=>x=2/11+1/5=21/55
3: x-5/6=16/42-8/56
=>x-5/6=8/21-4/28=5/21
=>x=5/21+5/6=15/14
4: x/5=5/6-19/30
=>x/5=25/30-19/30=6/30=1/5
=>x=1
5: =>|x|=1/3+1/4=7/12
=>x=7/12 hoặc x=-7/12
6: x=-1/2+3/4
=>x=3/4-1/2=1/4
11: x-(-6/12)=9/48
=>x+1/2=3/16
=>x=3/16-1/2=-5/16
1)x= 1/4
2)x= 2/11+ 1/5
x= 21/55
3)x - 5/6 = 5/21
x = 5/21+5/6
x = 15/14
4)x/5 = 5/6 + -19/30
x:5 = 1/5
x = 1/5.5
x = 1
5) |x| - 1/4 = 6/18
|x| = 6/18 - 1/4
|x| =7/12
⇒x= 7/12 hoặc -7/12
6)x = -1/2 +3/4
x= 1/4
7) x/15 = 3/5 + -2/3
x:15 = -1/15
x = -1/15. 15
x = -1
8)11/8 + 13/6 = 85/x
85/24 = 85/x
⇒ x = 24
9) x - 7/8 = 13/12
x = 13/12 + 7/8
x = 47/24
10)x - -6/15 = 4/27
x = 4/27 + (-6/15)
x = -34/135
11) -(-6/12)+x = 9/48
x= 9/48 - 6/12
x = -5/16
12) x - 4/6 = 5/25 + -7/15
x -4/6 = -4/15
x = -4/15 + 4/6
x = 2/5
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a, |x-7|=|9-234|
=> |x-7|=|-225|
=> |x-7|=225
=>\(\orbr{\begin{cases}x-7=225\\x-7=-225\end{cases}}\)=>\(\orbr{\begin{cases}x=232\\x=-218\end{cases}}\)
b, \(\left(\frac{x}{8}\right)^2+\frac{3}{16}=\frac{7}{16}\)
=>\(\left(\frac{x}{8}\right)^2=\frac{7}{16}-\frac{3}{16}\)
=>\(\left(\frac{x}{8}\right)^2=\frac{1}{4}\)
=>\(\left(\frac{x}{8}\right)^2=\left(\frac{1}{2}\right)^2\)
=>\(\orbr{\begin{cases}\frac{x}{8}=\frac{1}{2}\\\frac{x}{8}=\frac{-1}{2}\end{cases}}\)=>\(\orbr{\begin{cases}x.2=8\\x.2=-8\end{cases}}\)=>\(\orbr{\begin{cases}x=4\\x=-4\end{cases}}\)
c, (8-32)2+(x-39)2=10
=>(-1)2+(x-39)2=10
=>(x-39)2=10-1
=>(x-39)2=9
=>(x-39)2=32
=>\(\orbr{\begin{cases}x-39=3\\x-39=-3\end{cases}}\)=>\(\orbr{\begin{cases}x=42\\x=36\end{cases}}\)
a)\(\left|x-7\right|=\left|9-234\right|\)
\(\Rightarrow\left|x-7\right|=\left|-225\right|\)
\(\Rightarrow\left|x-7\right|=225\)
\(\Rightarrow x-7=\pm225\)
- \(x-7=225\Rightarrow x=232\)
- \(x-7=-225\Rightarrow x=-218\)
Vậy \(x\in\left\{232;-218\right\}\)
b)\(\left(\frac{x}{8}\right)^2+\frac{3}{16}=\frac{7}{16}\)
\(\Rightarrow\left(\frac{x}{8}\right)^2=\frac{7}{16}-\frac{3}{16}\)
\(\Rightarrow\left(\frac{x}{8}\right)^2=\frac{4}{16}\)
\(\Rightarrow\left(\frac{x}{8}\right)^2=\frac{1}{4}\)
\(\Rightarrow\left(\frac{x}{8}\right)^2=\left(\pm\frac{1}{2}\right)^2\)
\(\Rightarrow\frac{x}{8}=\pm\frac{1}{2}\)
- \(\Rightarrow\frac{x}{8}=\frac{1}{2}\Rightarrow\frac{x}{8}=\frac{4}{8}\Rightarrow x=4\)
- \(\Rightarrow\frac{x}{8}=\frac{-1}{2}\Rightarrow\frac{x}{8}=\frac{-4}{8}\Rightarrow x=-4\)
Vậy \(x\in\left\{\pm4\right\}\)
c)\(\left(8-3^2\right)^2+\left(x-39\right)^2=10\)
\(\Rightarrow\left(8-9\right)^2+\left(x-39\right)^2=10\)
\(\Rightarrow\left(-1\right)^2+\left(x-39\right)^2=10\)
\(\Rightarrow1+\left(x-39\right)^2=10\)
\(\Rightarrow\left(x-39\right)^2=9\)
\(\Rightarrow\left(x-39\right)^2=\left(\pm3\right)^2\)
\(\Rightarrow x-39=\pm3\)
- \(\Rightarrow x-39=3\Rightarrow x=42\)
- \(\Rightarrow x-39=-3\Rightarrow x=36\)
Vậy \(x\in\left\{42;36\right\}\)
\(\frac{8}{3}:x=\frac{16}{9}:\frac{8}{3}\)
\(\frac{8}{3}:x=\frac{16}{9}.\frac{3}{8}\)
\(\frac{8}{3}:x=\frac{2}{3}\)
\(x=\frac{8}{3}:\frac{2}{3}\)
\(x=\frac{8}{3}.\frac{3}{2}\)
\(x=4\)
Vậy x = 4