Question

[Duy Đinh Tiến]

Tìm x, y thuộc Z

a, x/6-1/y=1/2

b, (x-1).(y+x)= 7

Answer 1

[Thanh Tùng DZ]

a) \(\frac{x}{6}-\frac{1}{y}=\frac{1}{2}\)

\(\frac{1}{y}=\frac{x}{6}-\frac{1}{2}\)

\(\frac{1}{y}=\frac{x}{6}-\frac{3}{6}\)

\(\frac{1}{y}=\frac{x-3}{6}\)

\(\Rightarrow1.6=y.\left(x-3\right)\)

\(\Rightarrow6=y.\left(x-3\right)\)

x-3	1	6	-1	-6	2	3	-3	-2
y	6	1	-6	-1	3	2	-2	-3
x	4	9	2	-3	5	6	0	1

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