Giải phương trình:
1, \(\left(x+3\right)\left(3x^4+8x^2+12x+21\right)=5\left(x^2+1\right)^3\)
2, \(3\left(x^2+2x-1\right)^2-2\left(x^2+3x-1\right)^2+5x^2=0\)
3, \(\dfrac{x^2+x+1}{x+1}+\dfrac{x^2+2x+2}{x+2}-\dfrac{x^2+3x+3}{x+3}-\dfrac{x^2+4x+4}{x+4}=0\)
4, \(\left(\dfrac{x+6}{x-6}\right)\left(\dfrac{x+4}{x-4}\right)^2+\left(\dfrac{x-6}{x+6}\right)\left(\dfrac{x+9}{x-9}\right)^2=2.\dfrac{x^2+36}{x^2-36}\)
1. Giải phương trình, hệ phương trình:
a) 2x2 - 5x + 3 = 0
b) x2 - 3x = 0
c) \(\left\{{}\begin{matrix}2\left(x+1\right)-5\left(y+1\right)=5\\3\left(x+1\right)-2\left(y+1\right)=1\end{matrix}\right.\)
d) \(\left\{{}\begin{matrix}\dfrac{15}{x}-\dfrac{7}{y}=9\\\dfrac{4}{x}+\dfrac{9}{y}=35\end{matrix}\right.\)
Giải phương trình \(\left(\dfrac{x+1}{x-2}\right)^2+\dfrac{x+1}{x-4}-3\left(\dfrac{2x-4}{x-4}\right)^2=0\)
Giải phương trình:
1, \(\left(x^2+x+1\right)\left(x^4+2x^3+7x^2+26x+37\right)=5\left(x+3\right)^3\)
2, \(\left(x+1\right)^3+\left(x+3\right)^3+6\left(x+1\right)\left(x+7\right)\left(x+3\right)=8\left(x+2\right)^3\)
3, \(x^3+\left(x-1\right)^3+3x\left(x-1\right)\left(x^4+x\right)=\left(2x-1\right)^3\)
4, \(\dfrac{\left(x+1\right)^3}{3x+1}+\dfrac{x^3+5x+2}{x^3+2x+1}=x+3\)
5, \(\dfrac{5x^3+x^2+x+1}{4x^2+1}+\dfrac{6\left(4x^2+1\right)}{x^3+x^2+1}=x+7\)
6, \(\left(x^2-4x+1\right)^3+\left(8x-x^2+4\right)^3+\left(x-5\right)^3=125x^3\)
tìm m để phương trình \(\dfrac{x^2-2x+1}{x^2+4x+4}-m\left|\dfrac{x+2}{x-1}\right|=12\) có đúng 4 nghiệm
CMR nếu x,y∈Z\(^+\) thì một trong hai BĐT sau là sai:
\(\dfrac{1}{xy}\ge\dfrac{1}{\sqrt{5}}\left(\dfrac{1}{x^2}+\dfrac{1}{y^2}\right)\) và \(\dfrac{1}{x\left(x+y\right)}\ge\dfrac{1}{\sqrt{5}}\left(\dfrac{1}{x^2}+\dfrac{1}{\left(x+y\right)^2}\right)\)
Bài 1: Tìm x:
a) \(\left|x+\dfrac{4}{15}\right|-\left|-3,75\right|=-\left|-2,15\right|\)
b) \(\left|\dfrac{5}{3}x\right|=\left|-\dfrac{1}{6}\right|\)
c) \(\left|\dfrac{3}{4}x-\dfrac{3}{4}\right|-\dfrac{3}{4}=\left|-\dfrac{3}{4}\right|\)
Bài 2: Tìm x,y:
a) \(\left|\dfrac{1}{2}-\dfrac{1}{3}+x\right|=\dfrac{1}{4}-\left|y\right|\)
b) \(\left|x-y\right|+\left|y+\dfrac{9}{25}\right|=0\)
Bài 3: Tìm giá trị nhỏ nhất:
a) A= \(\left|x+\dfrac{15}{19}\right|-1\)
b) B= \(\dfrac{1}{2}+\left|x-\dfrac{4}{7}\right|\)
Bài 4: Tìm giá trị lớn nhất:
a) A= 5- \(\left|\dfrac{5}{3}-x\right|\)
b) B= 9-\(\left|x-\dfrac{1}{10}\right|\)
Giải phương trình
bài 1: \(\left(5x+3\right)^3-\left(2x+4\right)^3=\left(3x-1\right)^3\)
bài 2: \(\dfrac{x-1}{2013}+\dfrac{x-2}{2012}-\dfrac{x-3}{2011}=\dfrac{x-4}{2010}\)
bài 3: \(\left(2x-5\right)^3-\left(x-2\right)^3=\left(x-3\right)^3\)
bài 4: \(\dfrac{x+43}{57}+\dfrac{x+46}{54}=\dfrac{x+49}{51}+\dfrac{x+52}{48}\)
bài 5: \(\dfrac{x-17}{33}+\dfrac{x-21}{29}+\dfrac{x}{25}=4\)
Mọi ng` cố gắng giúp nha đc mình tick cả :) cảm ơn trước ạ
Giải phương trình \(\dfrac{3\left(x-\sqrt{3}\right)\left(x-\sqrt{5}\right)}{\left(1-\sqrt{3}\right)\left(1-\sqrt{5}\right)}+\dfrac{4\left(x-1\right)\left(x-\sqrt{5}\right)}{\left(\sqrt{3}-1\right)\left(\sqrt{3}-\sqrt{5}\right)}+\dfrac{5\left(x-1\right)\left(x-\sqrt{3}\right)}{\left(\sqrt{5}-1\right)\left(\sqrt{5}-\sqrt{3}\right)}=3x-2\)