tìm x thuộc Z
a)78-5 lx-1l= -35+43
b) (3lxl-24).73=2.74
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TN
0
LD
3
16 tháng 7 2017
\(\left(5x-24\right).73=2.74\)
\(\Leftrightarrow\left(5x-24\right).73=148\)
\(\Leftrightarrow5x-24=\frac{148}{73}\)
\(\Leftrightarrow5x=\frac{148}{73}+24\)
\(\Leftrightarrow5x=\frac{1900}{73}\)
\(\Leftrightarrow x=\frac{1900}{73}.\frac{1}{5}\)
\(\Leftrightarrow x=\frac{380}{73}\)
NL
Nguyễn Lê Phước Thịnh
CTVHS
14 tháng 4
a: \(x^3=27\)
=>\(x^3=3^3\)
=>x=3
b: \(\left(2x-1\right)^3=8\)
=>\(\left(2x-1\right)^3=2^3\)
=>2x-1=2
=>2x=2+1=3
=>\(x=\frac32=1,5\)
c: \(\left(x-2\right)^2=16\)
=>\(\left[\begin{array}{l}x-2=4\\ x-2=-4\end{array}\right.\Rightarrow\left[\begin{array}{l}x=4+2=6\\ x=-4+2=-2\end{array}\right.\)
d: \(\left(2x-3\right)^2=9\)
=>\(\left[\begin{array}{l}2x-3=3\\ 2x-3=-3\end{array}\right.\Longrightarrow\left[\begin{array}{l}2x=6\\ 2x=0\end{array}\right.\Rightarrow\left[\begin{array}{l}x=3\\ x=0\end{array}\right.\)
e: \(2x+5=3^4:3^2\)
=>\(2x+5=3^2=9\)
=>2x=9-5=4
=>\(x=\frac42=2\)
f: \(\left(3x-2^4\right)\cdot7^3=2\cdot7^4\)
=>\(3x-16=2\cdot\frac{7^4}{7^3}=2\cdot7=14\)
=>3x=16+14=30
=>\(x=\frac{30}{3}=10\)
NL
Nguyễn Lê Phước Thịnh
CTVHS
13 tháng 4
a: \(x^3=27\)
=>\(x^3=3^3\)
=>x=3
b: \(\left(2x-1\right)^3=8\)
=>\(\left(2x-1\right)^3=2^3\)
=>2x-1=2
=>2x=2+1=3
=>\(x=\frac32=1,5\)
c: \(\left(x-2\right)^2=16\)
=>\(\left[\begin{array}{l}x-2=4\\ x-2=-4\end{array}\right.\Rightarrow\left[\begin{array}{l}x=4+2=6\\ x=-4+2=-2\end{array}\right.\)
d: \(\left(2x-3\right)^2=9\)
=>\(\left[\begin{array}{l}2x-3=3\\ 2x-3=-3\end{array}\right.\Longrightarrow\left[\begin{array}{l}2x=6\\ 2x=0\end{array}\right.\Rightarrow\left[\begin{array}{l}x=3\\ x=0\end{array}\right.\)
e: \(2x+5=3^4:3^2\)
=>\(2x+5=3^2=9\)
=>2x=9-5=4
=>\(x=\frac42=2\)
f: \(\left(3x-2^4\right)\cdot7^3=2\cdot7^4\)
=>\(3x-16=2\cdot\frac{7^4}{7^3}=2\cdot7=14\)
=>3x=16+14=30
=>\(x=\frac{30}{3}=10\)
DK
2
NL
Nguyễn Lê Phước Thịnh
CTVHS
31 tháng 7 2023
a: =>5-x=-23
=>x=5+23=28
b: =>x-3-x+7-25+x=54
=>x-21=54
=>x=75
c: =>7-9x-2x+4=-5x-35+27-25=-5x-37
=>-11x+3=-5x-37
=>-6x=-40
=>x=20/3
T
31 tháng 7 2023
a.
10-x-5 = (-5) - 7 -11
=>5-x = 0
=>x=5
b
(x-3) - (x+17-24) - (25-x) = 24 - (-30)
=>x - 3 - x - 17 + 24 - 25 - x = 24 + 30
=>-x - 21 = 54
=>-x = 75
=>x = -75
c
(7 - 9x) - (2x - 4) = - (5x + 35) - (-27) - 25
=>7-9x - 2x + 4 = -5x - 35 + 27 - 35
=>11 - 11x + 5x = -43
=>16x = 11 + 43
=>16x = 54
=>x=4
BL
0
a/ \(78-5.|x-1|=-35+43.\)
\(78-5.|x-1|=8\)
\(5.|x-1|=78-8\)
\(5.|x-1|=70\)
\(|x-1|=70:5\)
\(|x-1|=14\)
\(\orbr{\begin{cases}x-1=14\\x-1=-14\end{cases}}\)\(\Rightarrow\orbr{\begin{cases}x=15\\x=-13\end{cases}}\)Vậy :.....
b/ \(\left(3.|x|-2^4\right).7^3=2.7^4\)
\(\left(3.|x|-2^4\right)=2.7^4:7^3\)
\(3.|x|-2^4=2.7=14\)
\(3.|x|=14+2^4=14+16=30\)
\(|x|=30:3=10\)
\(\orbr{\begin{cases}x=10\\x=-10\end{cases}}\)Vậy : .....
Nhớ k cho mình nhé! Thank you!!!