Question

Tìm x, y

x/2=5/y

Answer 1

\(\frac{x}{2}=\frac{5}{y}\)

\(\Rightarrow x\cdot y=2\cdot5\)

\(x\cdot y=10=1\cdot10=10\cdot1=2\cdot5=5\cdot2=\left(-1\right)\cdot\left(-10\right)=\left(-10\right)\cdot\left(-1\right)=\left(-2\right)\cdot\left(-5\right)=\left(-5\right)\cdot\left(-2\right)\)

Ta có bảng sau:

x	1	10	2	5	-1	-10	-2	-5
y	10	1	5	2	-10	-1	-5	-2

Vậy: \(\left(x;y\right)=\left(1;10\right);\left(10;1\right);\left(2;5\right);\left(5;2\right);\left(-1;-10\right);\left(-10;-1\right);\left(-2;-5\right);\left(-5;-2\right)\)

Answer 2

https://i.imgur.com/DY3o5fE.png