a) \(3-\sqrt{x}=\)0
\(\sqrt{x}=0+3\)
\(\sqrt{x}=3\)
mà :\(\sqrt{9}=3\)
=> x = 9
a)x=9
b)x=196
c)x=...câu này mình ko biết
Cho A=\(\left(1-\frac{\sqrt{x}}{\sqrt{x}+1}\right):\left(\frac{2+\sqrt{x}}{x-5\sqrt{x}+6}+\frac{3+\sqrt{x}}{\sqrt{x}-2}-\frac{2+\sqrt{x}}{\sqrt{x}-3}\right)\)
Tìm tập xác định và rút gọn A
Rút gọn : A=\(\left(1-\frac{\sqrt{x}}{\sqrt{x}+1}\right):\left(\frac{2+\sqrt{x}}{x-5\sqrt{x}+6}+\frac{3+\sqrt{x}}{\sqrt{x}-2}-\frac{2+\sqrt{x}}{\sqrt{x}-3}\right)\)
tìm số x dương biết
a)\(\frac{5}{11}.\sqrt{x}-\frac{1}{3}=\frac{1}{6}\)
b)\(\sqrt{x+1}-2=0\)
nhanh lên nha mn, tl trước 5h nha..
Tìm số x không âm biết:
a,3-\(\sqrt{x=0}\) b,\(2\sqrt{x-1=27}\) c\(\frac{5}{11}\sqrt{x-\frac{1}{3}}=\frac{1}{6}\)
tìm x biết :
a)\(2\sqrt{x}+3=0\)
b)\(\frac{5}{12}\sqrt{x}-\frac{1}{6}=\frac{1}{3}\)
c)\(\sqrt{x+3}+3=0\)
Tìm x biết:
a) \(\frac{1}{4}+\frac{1}{3}:2x=-5\)
b) \(\left(3x-\frac{1}{4}\right).\left(x+\frac{1}{2}\right)=0\)
c) \(|x+\frac{1}{5}|-\frac{1}{2}=\frac{9}{10}\)
d) \(\sqrt{0,81}.\left(\sqrt{x}+\sqrt{\frac{16}{49}}\right)=\frac{9}{10}\)
f) \(|\frac{1}{3}.\sqrt{x+1}-\frac{2}{9}|-\frac{1}{6}=\frac{1}{9}\)
Tìm x biết \(\frac{x+2}{327}+\frac{x+3}{326}+\frac{x+4}{325}+\frac{x+5}{324}+\frac{x+349}{5}=0\)
CMR:\(\frac{1}{2!}+\frac{2}{3!}+\frac{3}{4!}+...+\frac{99}{100!}< 1\)
\(\frac{1}{\sqrt{1}}+\frac{1}{\sqrt{2}}+\frac{1}{\sqrt{3}}+...+\frac{1}{\sqrt{100}}>10\)
Tính \(B=1+\frac{1}{2}\left(1+2\right)+\frac{1}{3}\left(1+2+3\right)+\frac{1}{4}\left(1+2+3+4\right)+...+\frac{1}{20}\left(1+2+3+...+20\right)\)
Tìm x, biét
1 . \(\sqrt{2x+\frac{5}{4}}=\frac{3}{2}\)
2 \(\sqrt{\frac{x}{3}-\frac{7}{6}}=\frac{1}{6}\)
Tìm x thuộc Z
a, \(\frac{\sqrt{x}-3}{\sqrt{x}+1}\)
b, \(\frac{2\left(\sqrt{2}-5\right)}{\sqrt{x}+1}\in Z\)
c, \(\frac{2\sqrt{x}+1}{3\sqrt{x}-1}\in Z\)
d, \(\frac{\sqrt{x}-2}{\sqrt{x}+2}\in Z\)