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a: x(x+5)=0
=>\(\left[{}\begin{matrix}x=0\\x+5=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=0\\x=-5\end{matrix}\right.\)
b: 2x(x+3)=0
=>x(x+3)=0
=>\(\left[{}\begin{matrix}x=0\\x+3=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=0\\x=-3\end{matrix}\right.\)
c: \(\left(6-x\right)\left(x+10\right)=0\)
=>\(\left[{}\begin{matrix}6-x=0\\x+10=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=6-0=6\\x=0-10=-10\end{matrix}\right.\)
d: \(\left(5x+20\right)\left(x^2+1\right)=0\)
=>\(5x+20=0\left(x^2+1>=1>0\forall x\right)\)
=>5x=-20
=>x=-4
1, \(\left(3x-6\right)\left(2x-10\right)=0\)
\(\Leftrightarrow3x-6=0or2x-10=0\Leftrightarrow x=3orx=5\)
or là từ '' hoặc ''
2, \(7\left(x+5\right)+10=5x-11\)
\(\Leftrightarrow7x+35+10=5x-11\)
\(\Leftrightarrow7x-5x=-11-10-35\)
\(\Leftrightarrow2x=-56\Leftrightarrow x=-28\)
1) 18 . x+x+x=48x25
=18 .x + 2. x=4 . 5. 12 .5
=20.x=20.60
=>x=120:20=60
2) [(2.x-5):(15+10)].20=100
(2x-5):25=20.100
(2x-5):25=2000
2x-5=2000x25
2x-5=50000
2x=50005
x=\(\frac{50005}{2}\)
1) 18.x+x+x=48.25
=> 20x=1200
=> x=60
2) [(2x-5):(15+10)].20=100
=> (2x-5):25 =5
=>2x-5= 125
=>2x=130
=>x=65
1, Tìm x :
a, \(x^7.x^5=3^{12}\)
\(\Rightarrow x^{12}=3^{12}\)
\(\Rightarrow x=3\)
Vậy x = 3
b, \(\left(x+1\right)^4=5^8\div25^4\)
\(\left(x+1\right)^4=5^8\div\left(5^2\right)^4\)
\(\left(x+1\right)^4=5^8\div5^8\)
\(\left(x+1\right)^4=1\)
\(\Rightarrow x\in\left\{0;1\right\}\)
Vậy \(x\in\left\{0;1\right\}\)
c, \(x^6=x\)
\(\Rightarrow x^6-x=0\)
\(\Rightarrow x.x^5-x.1=0\)
\(\Rightarrow x\left(x^5-1\right)=0\)
x = 0 hoặc x5 - 1 = 0
x = 0 hoặc x5= 1
x = 0 hoặc x5 = 1
\(\Rightarrow x\in\left\{0;1\right\}\)
Vậy \(x\in\left\{0;1\right\}\)
2, Tính :
\(\left(4^{20}+4^{15}\right)\div\left(4^{10}+4^5\right)\)
\(=4^{15}.\left(4^5+1\right)\div4^5.\left(4^5+1\right)\)
\(=4^{15}\div4^5\)
\(=4^{10}\)
Vậy giá trị biểu thức trên bằng 410
\(A=2^0+2^1+2^2+...+2^{2016}\)
\(2A=2+2^2+2^3+...+2^{2017}\)
\(2A-A=\left(2+2^2+2^3+...+2^{2017}\right)-\left(2^0+2^1+2^2+...+2^{2016}\right)\)
\(\Rightarrow A=2^{2017}-1\)
Vậy : \(A=2^{2017}-1\)
1) 2X - 2/5 = X - 7/10
2X - X = - 7/10 + 2/5
X = - 3/10
VẬY X = - 3/10
2) X - 1/3 = 2/5 - ( 8/15 -2X )
X - 1/3 = 2/5 - 8/15 + 2X
X - 1/3 = -2/15 + 2X
X - 2X = -2/15 + 1/3
-X = 1/5
X = - 1/5
VẬY X = -1/5
Bài 2:
a: =>x=0 hoặc x+3=0
=>x=0 hoặc x=-3
b: =>x-2=0 hoặc 5-x=0
=>x=2 hoặc x=5
c: =>x-1=0
hay x=1
a) \(\left(x+1\right).10=0\)
\(x+1=0\)
\(x=0-1\)
\(x=-1\)
b) \(15\left(x+2\right)=0\)
\(x+2=0\)
\(x=0-2\)
\(x=-2\)
c) \(\left(x-1\right).10=10\)
\(x-1=10:10\)
\(x-1=1\)
\(x=1+1\)
x = 2
d) \(\left(x-2\right):5=0\)
\(x-2=0\)
\(x=2\)