Tim a ,b,c de phuong trinh sau co vo so nghiem
\(\sqrt{x+a\sqrt{x}+b}=c-\sqrt{x}\)
tim m de he phuong trinh va phuong trinh co nghiem
\(a,\sqrt{x^2+3x+2m}=\sqrt{4x-x^2}\)
b, \(\left\{{}\begin{matrix}x+y+1=x\\x^2+y^2=m\end{matrix}\right.\)
cho phuong trinh:\(\dfrac{2+\sqrt{x}}{\sqrt{2}+\sqrt{2+\sqrt{x}}}+\dfrac{2-\sqrt{x}}{\sqrt{2}-\sqrt{2-\sqrt{x}}}=\sqrt{2}\)
a/tim dieu kien cua x de phuong trinh co nghia
b/giai phuong trinh
a: ĐKXĐ: x>=0
b: \(\Leftrightarrow\dfrac{2\sqrt{2}-2\sqrt{2-\sqrt{x}}+\sqrt{2x}-\sqrt{x\left(2-\sqrt{x}\right)}+2\sqrt{2}+2\sqrt{2+\sqrt{x}}-\sqrt{2x}-\sqrt{x\left(2+\sqrt{x}\right)}}{2-2+\sqrt{x}}=\sqrt{2}\)
\(\Leftrightarrow4\sqrt{2}-2\sqrt{x\left(\sqrt{x}+2\right)}=\sqrt{2x}\)
\(\Leftrightarrow\sqrt{4x\left(\sqrt{x}+2\right)}=4\sqrt{2}-\sqrt{2x}\)
\(\Leftrightarrow4x\left(\sqrt{x}+2\right)=32-16\sqrt{x}+2x\)
\(\Leftrightarrow4x\sqrt{x}+8x-32+16\sqrt{x}-2x=0\)
=>\(x\in\left\{0;1.2996\right\}\)
1) phuong trinh \(\dfrac{4}{\sqrt{x+2}}+\sqrt{x-2}=\sqrt{2-x}\) co bao nhieu nghiem:
A. 1 B. 2 C. Vo so D. 0
phương trình này vô số nghiệm á bạn
đáp án là câu C nha
a,Tim m de phuong trinh sau co nghiem :
4-m=\(\dfrac{2}{x+1}\)
b,Tim m de phuong trinh tren co nghiem
\(4-m=\dfrac{2}{x+1}\)
Đkxđ : x +1 ≠ 0 ⇔x ≠ -1
\(\forall\) x≠-1; \(\dfrac{2}{x+1}\ne0\)
để pt có nghiệm thì 4 - m ≠ 0 ⇔ m ≠ 4
vậy m ≠ 4 thì pt có nghiệm
(a)<=>(b)
\(\Leftrightarrow\left\{{}\begin{matrix}x\ne-1\\\left(4-m\right)\left(x+1\right)=2\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}m\ne4\\x=\dfrac{2}{4-m}-1=\dfrac{2-\left(4-m\right)}{4-m}=\dfrac{m-2}{4-m}\end{matrix}\right.\)
\(x\ne-1\Leftrightarrow\dfrac{m-2}{4-m}\ne-1\Leftrightarrow m-2\ne m-4\Leftrightarrow-2\ne-4\forall m\)
ket luan : m khac 4
tim tham so m de phuong trinh \(x^2\)-2x+2-2(m+1)(x-1)= \(4\sqrt{\left(x-1\right)\left(2x^2-4x+4\right)}\) co nghiem
tim tham so m de phuong trinh \(x^2\)-2x+2-2(m+1)(x-1)= \(4\sqrt{\left(x-1\right)\left(2x^2-4x+4\right)}\) co nghiem
1Tim m de m(m-3) x+m-3=0
a,co nghiem duy nhat
b,vo nghiem
c,co vo so nghiem
2 Tim m thuoc z de pt(m-3)x+m-1=0 co nghiem nguyen.
3 Tim m de pt m(m-3)x+m^2-9=0 co nghiem duy nhat?vo nghiem?co vo so nghiem?
Tim cac gia tri cua m de tap nghiem cua phuong trinh x4 - 2(m-1)x2 -(m-3)=0 co
a, 4 phan tu
b, 3 phan tu
c, 2 phan tu
d, khong co phan tu nao (vo nghiem)
Cho phuong trinh \(ax^2+bx+1=0\) voi a,b la cac so huu ti.Tim a,b biet \(x=\frac{\sqrt{5}-\sqrt{3}}{\sqrt{5}+\sqrt{3}}\)la nghiem cua phuong trinh