a: =>xy=-6
hay \(\left(x,y\right)\in\left\{\left(1;-6\right);\left(-1;6\right);\left(-6;1\right);\left(6;-1\right);\left(2;-3\right);\left(-3;2\right);\left(-3;2\right);\left(2;-3\right)\right\}\)
b: \(\Leftrightarrow\dfrac{x}{3}=\dfrac{4}{y^2}=-4\)
\(\Leftrightarrow x=-12;y\in\varnothing\)
Tìm các số nguyên x,y biết:
a)\(\dfrac{6}{2x+1}=\dfrac{2}{7}\)
b) \(\dfrac{24}{7x-3}=\dfrac{-4}{25}\)
c) \(\dfrac{4}{x-6}=\dfrac{y}{24}=\dfrac{-12}{18}\)
d) \(\dfrac{-1}{5}\le\dfrac{x}{8}\le\dfrac{1}{4}\)
e) \(\dfrac{x+46}{20}=x\dfrac{2}{5}\)
f) \(y\dfrac{5}{y}=\dfrac{86}{y}\) ( \(x\dfrac{2}{5};y\dfrac{5}{y}\) là các hỗn số)
Tìm các số nguyên x và y, biết:
a)\(\dfrac{x}{7}=\)\(\dfrac{6}{21}\) b)\(\dfrac{-5}{y}\)= \(\dfrac{20}{28}\)
c)\(\dfrac{-4}{8}=\)\(\dfrac{-7}{y}\)
Tìm x, y, z, t ∈ Z biết:
a, \(\dfrac{5}{x}=\dfrac{-10}{12}\) b, \(\dfrac{4}{-6}=\dfrac{x+3}{9}\) c, \(\dfrac{x-1}{25}=\dfrac{4}{x-1}\) d, \(\dfrac{x+1}{y}=\dfrac{-3}{5}\)
e, \(\dfrac{-12}{6}=\dfrac{x}{5}=\dfrac{-y}{3}=\dfrac{Z}{-17}=\dfrac{-t}{-9}\)
h, \(\dfrac{-24}{-6}=\dfrac{x}{3}=\dfrac{4}{y^2}=\dfrac{Z^3}{-2}\)
Tìm số nguyên x, y biết:
\(a,\dfrac{x}{5}=\dfrac{-18}{10}\) b, \(\dfrac{6}{x-1}=\)\(\dfrac{-3}{7}\) c, \(\dfrac{y-3}{12}\)=\(\dfrac{3}{y-3}\) d, \(\dfrac{x}{25}\)=\(\dfrac{-5}{x^2}\)
Tìm các số nguyên x,y biết :
a). \(\dfrac{x}{2}\)=\(\dfrac{-5}{y}\). b). \(\dfrac{3}{x}\)=\(\dfrac{y}{4}\), trong đó x > y > 0.
c). \(\dfrac{3}{x-1}\)= y+1. d). \(\dfrac{x+2}{5}\)=\(\dfrac{1}{y}\).
Tìm các số nguyên x,y biết :
a) \(\dfrac{x}{3}=\dfrac{4}{y}\) ; b) \(\dfrac{x}{y}=\dfrac{2}{7}\) .
Tìm các số nguyên x, y, z, t biết : \(\dfrac{24}{4}=\dfrac{-x}{3}=\dfrac{3}{y^2}=\dfrac{\left(z+3\right)^3}{-4}=\dfrac{\left||t|-2\right|}{8}\)
Bài 4. Tìm x biết:
a. \(\dfrac{x}{5}=\dfrac{2}{5},\dfrac{3}{8}=\dfrac{6}{x},\dfrac{1}{9}=\dfrac{x}{27}\)
b. \(\dfrac{4}{x}=\dfrac{8}{6},\dfrac{3}{x-5}=\dfrac{-4}{x+2},\dfrac{x}{-2}=\dfrac{-8}{x}\)
Tìm các số nguyên dương x biết:
a)\(\dfrac{19}{-23}\)\(< \dfrac{-19}{x}\)\(< \dfrac{19}{-29}\) b)\(\dfrac{2}{3}\)\(< \dfrac{88}{x}\)\(< \dfrac{11}{16}\) c)\(\dfrac{4}{x}\)\(< \dfrac{x}{8}\)\(< \dfrac{5}{x}\)
Tìm x, biết:
a) \(x:\dfrac{6}{13}=\dfrac{13}{7}\) b) \(\dfrac{4}{7}.x-\dfrac{2}{3}=\dfrac{1}{5}\) c) \(\left(\dfrac{3}{10}-x\right):\dfrac{2}{5}=\dfrac{3}{5}\) d) \(\dfrac{2}{3}.x-\dfrac{7}{6}=\dfrac{5}{2}\)
