Question

Tìm các số nguyên x,y . Biết rằng : 

b) \(\frac{x}{y}=\frac{21}{35}\)

c) \(\frac{x}{5}=\frac{-3}{y}\)

d) \(\frac{-11}{x}=\frac{y}{3}\)

Answer 1

b: =>x/y=3/5

=>5x-3y=0

c: =>xy=-15

\(\Leftrightarrow\left(x,y\right)\in\left\{\left(1;-15\right);\left(-15;1\right);\left(-1;15\right);\left(15;-1\right);\left(3;-5\right);\left(-5;3\right);\left(-3;5\right);\left(5;-3\right)\right\}\)

d: =>xy=-33

\(\Leftrightarrow\left(x,y\right)\in\left\{\left(1;-33\right);\left(-33;1\right);\left(-1;33\right);\left(33;-1\right);\left(3;-11\right);\left(-11;3\right);\left(-3;11\right);\left(11;-3\right)\right\}\)