2x2 + 3x + 1 = 0
\(\Rightarrow\) 2x2 + 2x + x + 1 = 0
\(\Rightarrow\) 2x ( x + 1 ) + ( x + 1 ) = 0
\(\Rightarrow\) ( x + 1 )( 2x + 1 ) = 0
\(\Rightarrow\left[{}\begin{matrix}x+1=0\\2x+1=0\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=-1\\x=-\frac{1}{2}\end{matrix}\right.\)
\(\Rightarrow\) \(S=\left\{-1;-\frac{1}{2}\right\}\)
( x2 + 1 )( x - 1 ) = 0
Mà x2 + 1 > 0
=> x - 1 = 0
=> x = 1
tìm x biết
\(9\left(x+2\right)-3\left(x+2\right)=0\)
\(x\left(x+5\right)+\left(x-3\right)\left(x+5\right)=0\)\(3x^2+6x=0\)
\(2\left(2x-5\right)-3x=0\)
\(\left(x-1\right)^2+x\left(5-x\right)=0\)
\(\left(2x-3\right)\left(2x+3\right)-\left(x+5\right)^2-3\left(x-1\right)\left(x+2\right)\)=0
\(\left(2x-1\right)^2-45=0\)
\(2x^2-6x=0\)
giúp vs can gap
Giải các phương trình sau :
a) \(\left(x-1\right)\left(5x+3\right)=\left(3x-8\right)\left(x-1\right)\)
b) \(3x\left(25x+15\right)-35\left(5x+3\right)=0\)
c) \(\left(2-3x\right)\left(x+11\right)=\left(3x-2\right)\left(2-5x\right)\)
d) \(\left(2x^2+1\right)\left(4x-3\right)=\left(2x^2+1\right)\left(x-12\right)\)
e) \(\left(2x-1\right)^2+\left(2-x\right)\left(2x-1\right)=0\)
f) \(\left(x+2\right)\left(3-4x\right)=x^2+4x+4\)
Bằng cách phân tích vế trái thành nhân tử, giải các phương trình sau :
a) \(2x\left(x-3\right)+5\left(x-3\right)=0\)
b) \(\left(x^2-4\right)+\left(x-2\right)\left(3-2x\right)=0\)
c) \(x^3-3x^2+3x-1=0\)
d) \(x\left(2x-7\right)-4x+14=0\)
e) \(\left(2x-5\right)^2-\left(x+2\right)^2=0\)
f) \(x^2-x-\left(3x-3\right)=0\)
Giải phương trình sau:
(x+5)(x−1)=2x(x−1)
5(x+3)(x−2)−3(x+5)(x+2)=0
\(2x^3+5x^2-3x=0\)
\(\left(x-1\right)^2+2\left(x-1\right)\left(x+2\right)+\left(x+2\right)^2=0\)
bài 1 : cac phương trinh sau
a,\(\left(2x-4\right)\left(\dfrac{7x+2}{5}+\dfrac{2\left(1-3x\right)}{3}\right)\)
b, \(\left(2x-1\right)^2+2\left(2-x\right)\left(2x-1\right)=0\)
c, \(x^3+1=x\left(x+1\right)\)
d, \(x^3-\dfrac{1}{4}x\)
e, \(4x^2-1=0\)
g, (\(2x-1)^2-\left(x+3\right)^3\)
h, \(x\left(x^2-5\right)^2-4x=0\)
i, \(x^2-4+\left(x-2\right)^2\)
k, (x-1)(5x+3)=(3x-8)(x-1)
l, \(x^3+x^2+x+1=0\)
Các bạn ơi ! giúp mik với đi
Bài 1: Giải các phương trình sau:
a. (x - 1)2 (3x - 1)= 0
b.\(\left(\frac{2x}{3}+4\right)\left(2x-3\right)\left(\frac{x}{2}-1\right)=0\)
c.\(\left(x^2-4\right)\left(\frac{x}{4}-\frac{4x+5}{3}\right)=0\)
giải phương trình
\(-6\left(-x^2-x+1\right)^4+x^2\left(-x^2-x+1\right)^2+5x^4=0\)
b) \(x^4+9=5x\left(x^2-3\right)\)
c) \(x^4+\left(x+1\right)\left(5x^2-6x-6\right)=0\)
d)\(\left(x^2+1\right)^2+\left(x+1\right)\left(3x^2+2x-2\right)=0\)
e) \(x^2\left(x-1\right)^2+x\left(x^2-1\right)=2\left(x+1\right)^2\)
Giải phương trình:
a) \(x^2-\left(x+3\right)\left(3x+1\right)=9\).
b) \(x^3+4x+5=0\).
c) \(\left(x+14\right)^3-\left(x+12\right)^3=1352\).
d) \(x^3+\left(x-3\right)^3=\left(2x-3\right)^3\).
e) \(x\left(x+1\right)\left(x+2\right)\left(x+3\right)=360\).
f) \(x^3+\left(x-2\right)\left(2x+1\right)=8\).
Giải các phương trình :
a) \(\left(3x-2\right)\left(4x+5\right)=0\)
b) \(\left(2,3x-6,9\right)\left(0,1x+2\right)=0\)
c) \(\left(4x+2\right)\left(x^2+1\right)=0\)
d) \(\left(2x+7\right)\left(x-5\right)\left(5x+1\right)=0\)
