Tim x biet:(-35-67).(3x +27)=0
Tim x biet
c) (x - 2)(x + 3)>0
d) \(-1\frac{5}{27}-\left(3x-\frac{7}{9}\right)^3=-\frac{24}{27}\)
Bài làm:
c) \(\left(x-2\right)\left(x+3\right)>0\)
Ta xét 2 trường hợp sau:
+ Nếu \(\hept{\begin{cases}x-2>0\\x+3>0\end{cases}\Rightarrow}\hept{\begin{cases}x>2\\x>-3\end{cases}\Rightarrow}x>2\)
+ Nếu \(\hept{\begin{cases}x-2< 0\\x+3< 0\end{cases}}\Rightarrow\hept{\begin{cases}x< 2\\x< -3\end{cases}}\Rightarrow x< -3\)
Vậy \(\orbr{\begin{cases}x>2\\x< -3\end{cases}}\)
d) \(-1\frac{5}{27}-\left(3x-\frac{7}{9}\right)^3=-\frac{24}{27}\)
\(\Leftrightarrow-\frac{32}{27}-\left(3x-\frac{7}{9}\right)^3=-\frac{24}{27}\)
\(\Leftrightarrow\left(3x-\frac{7}{9}\right)^3=-\frac{8}{27}\)
\(\Leftrightarrow\left(3x-\frac{7}{9}\right)^3=\left(-\frac{2}{3}\right)^3\)
\(\Rightarrow3x-\frac{7}{9}=-\frac{2}{3}\)
\(\Leftrightarrow3x=\frac{1}{9}\)
\(\Leftrightarrow x=\frac{1}{27}\)
Vậy \(x=\frac{1}{27}\)
Học tốt!!!!
tim x biet 3x=5y+35
pt vô số nghiệm \(\left(x;y\right)=\left(x;\frac{3x-35}{5}\right)\)
tim so nghuyen x biet:
a, 12+(2x-11)=53
b, 21-(-6+3x)=9
c, -(2x+4)+11=-27
d, 33-(33-x)=0
a) 12+(2x-11)=53
(2x-11) = 53-12
2x-11= 41
2x=41+11
2x=52
x= 52:2
x=26
Vậy...
\(b,21-\left(-6+3x\right)=9\)
\(\Rightarrow21+6-3x=9\)
\(\Rightarrow27-3x=9\)
\(\Rightarrow3x=18\)
\(\Rightarrow x=6\)
c, -(2x+4)+11=-27
=>-2x-4+11=-27
=>-2x+7=-27
=>-2x = -34
=>x=17
d, 33-(33-x)=0
=>33-33+x=0
=>x=0
tim so tu nhien x biet: (x - 35) - 120 = 0
tim x biet x^3-3x^2+3x-1=0
x^3 - 3x^2 + 3x - 1 = 0
( x- 1)^3 = 0
=> x -1 = 0
=> x = 1
tim x biet 2/3x-(70+10/11):(13/15+13/35+13/63+13/99)=-5
x = 60 nha bn !!!
có cần cách giải ko , mik ghi cho
tim x biet x^3-3x=0
\(x^3-3x=0\\ \Leftrightarrow x\left(x^2-3\right)=0\\ \orbr{\begin{cases}x=0\\x^2-3=0\end{cases}}\\ \orbr{\begin{cases}x=0\\x^2=3\end{cases}}\\ \orbr{\begin{cases}x=0\\x=+_-\sqrt{3}\end{cases}}\)
x3 - 3x = 0
x.x2 - 3x = 0
x.(x2 - 3) = 0
=> x = 0 hoặc x2 - 3 = 0
=> x = 0 hoặc x2 = 3
=> x = 0 hoặc x = \(\sqrt{3}\)
x3-3x=0
=>x(x2-3)=0
=>\(\hept{\begin{cases}x=0\\x^2-3=0\end{cases}=>\orbr{\begin{cases}x=0\\x=+-\sqrt{3}\end{cases}}}\)
Ai k mk mk sẽ k lại
tim x biet x^2+3x+1=0
tim x,biet
a)x-6=35:7+42:6
b)x-54:27=42-26:2
c)36:x+81:x=130:10
a. x -6 = 35 : 7 + 42 : 6
=> x - 6 = 5 + 7
=> x -6 = 12
=> x = 12 + 6
=> x = 18
Các câu sau tương tự, bạn học tốt nha! .-.
a)x-6=5+7
x-6=12
x=6.
b)x-2=42-13
x-2=29
x=29+2
x=31
c)(36+81):x=13
117:x=13
x=117:13
x=9.
a)x-6=35:7+42:6
x-6=5+7
x-6=12
x=12:6
x=2
Vậy x=2