a) 4x : 17 = 0
b) 7x - 8 = 713
c) 8( x - 3) = 0
d) 0 : x = 0
K
Khách
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Những câu hỏi liên quan
23 tháng 10 2021
e: ta có: \(4x^2+4x-6=2\)
\(\Leftrightarrow4x^2+4x-8=0\)
\(\Leftrightarrow\left(x+2\right)\left(x-1\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=-2\\x=1\end{matrix}\right.\)
f: Ta có: \(2x^2+7x+3=0\)
\(\Leftrightarrow\left(x+3\right)\left(2x+1\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=-3\\x=-\dfrac{1}{2}\end{matrix}\right.\)
25 tháng 10 2021
\(a,\Leftrightarrow\left(4x-8\right)\left(x+1\right)=0\\ \Leftrightarrow4\left(x-2\right)\left(x+1\right)=0\Leftrightarrow\left[{}\begin{matrix}x=2\\x=-1\end{matrix}\right.\\ b,\Leftrightarrow\left(x+1\right)\left(x^2+1\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}x=-1\\x^2=-1\left(vô.lí\right)\end{matrix}\right.\Leftrightarrow x=-1\\ c,\Leftrightarrow x^2-2x-4x+8=0\\ \Leftrightarrow\left(x-2\right)\left(x-4\right)=0\Leftrightarrow\left[{}\begin{matrix}x=2\\x=4\end{matrix}\right.\\ d,\Leftrightarrow x^3-3x^2+3x-9x+2x-6=0\\ \Leftrightarrow\left(x-3\right)\left(x^2+3x+2\right)=0\\ \Leftrightarrow\left(x-3\right)\left(x^2+x+2x+2\right)=0\\ \Leftrightarrow\left(x-3\right)\left(x+1\right)\left(x+2\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}x=3\\x=-1\\x=-2\end{matrix}\right.\)
25 tháng 10 2021
a) \(\Rightarrow4\left(x+1\right)\left(x-2\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x=-1\\x=2\end{matrix}\right.\)
b) \(\Rightarrow x^2\left(x+1\right)+\left(x+1\right)=0\)
\(\Rightarrow\left(x+1\right)\left(x^2+1\right)=0\)
\(\Rightarrow x=-1\left(do.x^2+1\ge1>0\right)\)
c) \(\Rightarrow x\left(x-4\right)-2\left(x-4\right)=0\)
\(\Rightarrow\left(x-4\right)\left(x-2\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x=4\\x=2\end{matrix}\right.\)
d) \(\Rightarrow x^2\left(x-3\right)+3x\left(x-3\right)+2\left(x-3\right)\)
\(\Rightarrow\left(x-3\right)\left(x^2+3x+2\right)=0\)
\(\Rightarrow\left(x-3\right)\left(x+1\right)\left(x+2\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x=3\\x=-2\\x=-1\end{matrix}\right.\)
C
3
31 tháng 7 2021
a) \(\text{5x(x-2)+(2-x)=0}\)
\(\Rightarrow5x\left(x-2\right)-\left(x-2\right)=0\\ \Rightarrow\left(x-2\right)\left(5x-1\right)=0\\ \Rightarrow\left[{}\begin{matrix}x-2=0\\5x-1=0\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=2\\x=\dfrac{1}{5}\end{matrix}\right.\)
b) \(\text{x(2x-5)-10x+25=0}\)
\(\Rightarrow x\left(2x-5\right)-5\left(2x-5\right)=0\\ \Rightarrow\left(x-5\right)\left(2x-5\right)=0\\ \Rightarrow\left[{}\begin{matrix}x-5=0\\2x-5=0\end{matrix}\right.\\ \Rightarrow\left[{}\begin{matrix}x=5\\x=2,5\end{matrix}\right.\)
31 tháng 7 2021
c) \(\dfrac{25}{16}-4x^2+4x-1=0\)
\(\Rightarrow\dfrac{9}{16}-4x^2+4x=0\)
\(\Rightarrow-4x^2+4x+\dfrac{9}{16}=0\)
\(\Rightarrow-4x^2-\dfrac{1}{2}x+\dfrac{9}{2}x+\dfrac{9}{16}=0\)
\(\Rightarrow\left(-4x^2-\dfrac{1}{2}x\right)+\left(\dfrac{9}{2}x+\dfrac{9}{16}\right)=0\)
\(\Rightarrow-\dfrac{1}{2}x\left(8x+1\right)+\dfrac{9}{16}\left(8x+1\right)=0\)
\(\Rightarrow\left(-\dfrac{1}{2}x+\dfrac{9}{16}\right)\left(8x+1\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}-\dfrac{1}{2}x+\dfrac{9}{16}=0\\8x+1=0\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=\dfrac{9}{8}\\x=\dfrac{-1}{8}\end{matrix}\right.\)
TQ
5
26 tháng 5 2016
a)7x-8=713
7x =713+8
7x =721
x =721:7
x =103
Vậy x=103
b)8(x-3)=0
x-3=0:8
x-3=0
x=0+3
x=3
Vậy x=0
4x:7=0
4x =0*7
4x =0
x =0:4
x =0
Vậy x=0
C
6
14 tháng 9 2017
a) \(4x:17=0\)
\(4x=0\)
\(x=0\)
vay \(x=0\)
b) \(7x-8=713\)
\(7x=713+8\)
\(7x=721\)
\(x=103\)
vay \(x=103\)
c) \(8\left(x-3\right)=0\)
\(8x-24=0\)
\(8x=24\)
\(x=3\)
vay \(x=3\)
d) \(0:x=0\)
\(\Rightarrow x\in R\) va \(x\ne0\)
vay \(x\in R\)va \(x\ne0\)
S
20 tháng 9 2016
a) 4X : 17 = 0
4X= 0 x17
4X = 0
X = 0 : 4
X = 0
Vậy X = 0
b) 7X - 8 = 713
7X = 713 + 8
7X = 721
X = 721 : 7
X = 103
Vậy X = 103
c) 8 ( X - 3 ) = 0
X - 3 = 0 : 8
X - 3 = 0
X = 0 + 3
X = 3
Vậy X = 3
20 tháng 9 2016
a. 4x : 17 = 0
=> 4x=0.17
=> 4x=0
=> x=0:4
=> x=0
b. 7x - 8 = 713
=> 7x=713+8
=> 7x = 721
=> x = 721 : 7
=> x= 103
c. 8(x - 3) = 0
=> x-3=0:8
=> x-3=0
=> x=0+3
=> x=3
Bài 1.
9 tháng 9 2015
a) 4x:17=0
4x=0x17
4x=0
x=0:4
x=0
b)7x-8=713
7x=213+8
7x=221
x=221:7
x=221/7
c)8(x-3)=0
8x - 8x3 = 0
8x -24=0
8x=0+24
8x=24
x=24:8
x=3
a/
4x:17=0
4x=0x17
4x=0
x=0:4
x=0
a. 4x : 17 = 0 <=> 4x = 0.17 = 0 => x = 0
b. 7x- 8 =713 <=> 7x = 713 + 8 = 721 => x = 721 : 7 = 103
c. 8 ( x - 3) = 0 <=> x - 3 = 0: 8 = 0 => x = 3
d. 0 : x = 0 với mọi x khác 0