Question

tìm số nguyên x,y biết 

1,x/9=-16/36

2.7/x=21/-39

3.x/5=6/-10

 

Answer 1

Answer 2

\(1,\dfrac{x}{9}=-\dfrac{16}{36}\)

\(\Leftrightarrow36x=-16\times9\)

\(\Leftrightarrow36x=-144\)

\(\Leftrightarrow x=-144:36\)

\(\Leftrightarrow x=-4\)

\(2,\dfrac{7}{x}=\dfrac{21}{-39}\)

\(\Leftrightarrow21x=7\times\left(-39\right)\)

\(\Leftrightarrow21x=-273\)

\(\Leftrightarrow x=-273:21\)

\(\Leftrightarrow x=-13\)

\(3,\dfrac{x}{5}=\dfrac{6}{-10}\)

\(\Leftrightarrow-10x=5\times6\)

\(\Leftrightarrow-10x=30\)

\(\Leftrightarrow x=3\)