\(\frac{2\sqrt{x}-1}{\sqrt{x}+2}=\frac{2\sqrt{x}+4-5}{\sqrt{x}+2}=\frac{2\left(\sqrt{x}+2\right)-5}{\sqrt{x}+2}=2-\frac{5}{\sqrt{x}+2}\)
Để
\(\Rightarrow\frac{5}{\sqrt{x}+2}\in Z\)
\(\Rightarrow5⋮\sqrt{x}+2\)
\(\Rightarrow\sqrt{x}+2\in\left(-1;1;-5;5\right)\)
\(\Rightarrow\sqrt{x}\in\left(-3;-1;-7;3\right)\)
\(\Rightarrow x\in\left(9;1;49\right)\)
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, \(\frac{\sqrt{x}-2}{\sqrt{x}+2}\in Z\)
tìm \(x\in Z\) để A=\(\frac{\sqrt{x+1}}{\sqrt{x-2}}\)\(\in Z\)
Bài 1: Cho \(A=\frac{\sqrt{x}-3}{2}\) Tìm \(x\in Z\)và \(x< 30\)để A có giá trị nguyên
Bài 2: Cho \(B=\frac{5}{\sqrt{x}-1}\)Tìm \(x\in Z\)để B có giá trị nguyên
a) Tìm \(x\in Z\)để \(B=\frac{3\sqrt{x}+5}{2\sqrt{x}-1}\)là số nguyên
b) Tìm \(x\in Z\)để \(C=\frac{5x+7}{x-3}\)là số nguyên
Tìm x \(\in\)Z để A =\(\frac{\sqrt{x}+1}{\sqrt{x}-3}\)\(\in\)Z
Tìm \(y\in Z\) sao cho:
\(\sqrt{x-y}+\sqrt{y-z}\le\sqrt{x-z}\)
B1: Tìm x\(\in\)Z để :a) \(\frac{2012\sqrt{x}+5}{1006\sqrt{x}+1}\in\)Z ; b) \(\frac{1-3x}{x+5}\in\)Z
1. tìm x, y
a, x - y +2xy =7
b, xy + 3x -y = 6
c, \(\frac{1}{x}\)+ \(\frac{1}{y}\)=\(\frac{1}{5}\)
d, (6 \(\sqrt{x-1}\)) \(⋮\)( 2\(\sqrt{x-3}\))
4. tìm x \(\in\)z
a, A =\(\frac{1-2x}{x+3}\)\(\in\)z
b, B = \(\frac{2012\sqrt{x+5}}{1006\sqrt{x+1}}\)\(\in\)z
HELP ME ........!!!!!!!!!
Tìm \(x\in Z\)để
\(A=\frac{2012\sqrt{x}+5}{2006\sqrt{x}+1x}\in Z\)
