\(\Leftrightarrow\left[{}\begin{matrix}\left\{{}\begin{matrix}x+5>0\\7-2x>0\end{matrix}\right.\\\left\{{}\begin{matrix}x+5< 0\\7-2x< 0\end{matrix}\right.\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}\left\{{}\begin{matrix}x>-5\\x< \dfrac{7}{2}\end{matrix}\right.\\\left\{{}\begin{matrix}x< -5\\x>\dfrac{7}{2}\end{matrix}\right.\end{matrix}\right.\Leftrightarrow-5< x< \dfrac{7}{2}\)
h) |3x + 1|-x-5=0 i) 2x|x + 1] = 7 j) 7|2x + 1] = x 1 c) √5²-2 1 √5+2 + d) 5+2√5 3+√3 √5 + -√5-√3 √3+1
Bài 1 : giải những các phương trình sau A. X² - 2x - 3 = 0 B. X² - 3x = 0 C. X² - 4x - 5 = 0 D. 5x² + 2x - 7 = 0 E. 2x² - 8 = 0 G. 3x² -7x + 1 = 0 H. X² - 4x + 1 = 0
Tìm x ≥ 0, biết:
a) 2x-7\(\sqrt{x}\)+3=0
b) 3\(\sqrt{x}\)+5 < 6
c) x-3\(\sqrt{x}\) -10 < 0
d) x- 5\(\sqrt{x}\) +6 = 0
e) x+ 5\(\sqrt{x}\) -14 < 0
1, \(\sqrt{x-1}+\sqrt{x-4}=5\)
2, \(2x-7\sqrt{x}+5=0\)
3, \(\sqrt{2x+1}+\sqrt{x-3}=2\sqrt{x}\)
4, \(x-4\sqrt{x}+2021\sqrt{x-4}+4=0\)
5, \(\sqrt{2x-3}-\sqrt{x+1}=7\left(4-x\right)\)
a. 3x⁴ - x² - 234 = 0 b. x/1-x = 2x+3/(x-1)(x+2) c. x²(x+1)-3x=3x²-2x-2 d. (x+4)(x+5)(x+7)(x+8)=4
Giải các phương trình sau:
a) |5x2 - 3| = 2
b) |x2 - 2x + 1| = x + 2
c) |2x - 5| - |2x2 - 7x + 5| = 0
d) |x + 3| + |7 - x| = 10
e) |x - 1| + |2 - x| = 2x
Tìm x
a) \(x+1-2\sqrt{x+1}=0\)
b) \(2x-4-\sqrt{x-2}=0\)
c) \(2\sqrt{9x-27}-\dfrac{1}{5}\sqrt{25x-75}-\dfrac{1}{7}\sqrt{49x-147}=20 \)
1) |2x - 1| = 5
2) |2x - 1| = |x + 5|
3) |3x + 1| = x - 2
4) |3 - 2x| = x + 2
5) |2x - 1| = 5 - x
6) |- 3x| = x - 2
7) |2 - 3x| = 2x + 1
8) |2x - 1| + |4x ^ 2 - 1| = 0
9) (2x + 5)/(x + 3) + 1 = 4/(x ^ 2 + 2x - 3) - (3x - 1)/(1 - x)
10) (x - 1)/(x + 3) - x/(x - 3) = (7x - 3)/(9 - x ^ 2)
11) 5 + 96/(x ^ 2 - 16) = (2x - 1)/(x + 4) + (3x - 1)/(x - 4)
12) (2x)/(2x - 1) + x/(2x + 1) = 1 + 4/((2x - 1)(2x + 1))
13) (x + 2)/(x - 2) - 1/x = 2/(x ^ 2 - 2x)
14) x/(2x - 6) + x/(2x + 2) = (2x + 4)/(x ^ 2 - 2x - 3)
Giải các phương trình:
a) √2x+5=5
b) √x-7 +3=0 (+3 ở ngoài ko có trong √x-7)
c) √3x+1=√10
d√16-7x=11
