\(\sqrt{5x^2+10x+1}=-\frac{1}{5}\left(5x^2+10x+1\right)+\frac{36}{5}\)
Đặt \(\sqrt{5x^2+10x+1}=t\left(t\ge0\right)\)
\(pt\Leftrightarrow t=-\frac{1}{5}t^2+\frac{36}{5}\)
\(\Leftrightarrow-t^2+36-5t=0\)
\(\Rightarrow t=4\left(tm\right)\)
\(\Leftrightarrow5x^2+10x+1=16\)
\(\Leftrightarrow\left[{}\begin{matrix}x=1\\x=-3\end{matrix}\right.\)
\(16x^2+10x+1=\sqrt{2x+3}\)
Giải phương trình:
a) \(5x^2-10x=4\left(x-1\right)\sqrt{x^2-2x+2}\)
b) \(\sqrt{2x^2+22x+29}-x-2=2\sqrt{2x+3}\)
c) \(x^3-7x^2+9x+12=\left(x-3\right)\left(x-2+5\sqrt{x-3}\right)\left(\sqrt{x-3}-1\right)\)
10x2-9x-8x\(\sqrt{2x^2-3x+1}\)+3=0
\(3x^2+10x+\sqrt{3x+3}=x^3+26+\sqrt{5-2x}\)
Gpt
\(\sqrt{3x+3}-\sqrt{5-2x}-x^3+3x^2+10x-16=0\)
√(60-24x-5x2)=x2+5x-10
Các bạn giúp mình với. Tks
1/ Gpt 4x2 - 8(2x+3)\(\sqrt{2x-1}=7-44x\)
2/ gpt x3- x2 - 10x -2 = \(\sqrt[3]{7x^2+23x+12}\)
3/ Choa,b,c > 0 và thỏa a+b+c =3
CM : \(\frac{a}{a+2bc}+\frac{b}{b+2ca}+\frac{c}{c+2ab}\ge1\)
1)\(\begin{cases}\sqrt{4x^2+\left(4x-9\right)\left(x-3y\right)}+\sqrt{3xy}=9y\\4\sqrt{\left(x+2\right)\left(3y+2x\right)}=3x+9\end{cases}\) 4)\(\begin{cases}\left(x^2+y\right)\sqrt{x-y+6}=2x^2-x+3y-2\\\sqrt{10x-xy-12}+1=\frac{y-x}{\sqrt{y-4}+\sqrt{6-x}}\end{cases}\)
2)\(\begin{cases}x^2+\left(y-6\right)^2=y+13x+27\\\sqrt{9x^2+\left(2x-3\right)\left(x-y\right)}+4\sqrt{xy}=7y\end{cases}\) 5)\(\begin{cases}\sqrt{4xy+\left(3\sqrt{xy}-7\right)\left(x-y\right)}+2\sqrt{xy}=4y\\\left(2x+1\right)\left[12y-1+9\sqrt{xy}-x^2-x\right]=27\left(x+1\right)\end{cases}\)
3)\(\begin{cases}\sqrt{\left(x+2\right)\left(y+1\right)+\left(x-y+1\right)\sqrt{y^2+1}}+\sqrt{x+2}=y+\sqrt{y+1}+1\\\sqrt{3x+1}-\sqrt{y+1}=2x^2+4x-y-1\end{cases}\)
Giải phương trình :
a. (\(\sqrt{x+4}\) -2)(\(\sqrt{4-x}\) -2)= -2x
b. 2.\(\sqrt[3]{6x-2}\) + 3\(\sqrt{6-10x}\) = 8
c. \(\sqrt[3]{x+2}\) + \(\sqrt[3]{14-x}\) = 4
d. \(\sqrt{5x-1}\) - \(\sqrt{3x+13}\) = \(\frac{x-7}{3}\)
giúp em với đang cần gấp ạ ?
