###### Exercise49

Choose the correct inequality or equal sign to make the relation true.

1. Let $$x$$ and $$y$$ be integers, such that $$x \lt y\text{.}$$

Then $$x-y$$

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$$y-x\text{.}$$

2. Let $$x$$ and $$y$$ be integers, such that $$1 \lt x \lt y \text{.}$$

Then $$xy$$

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$$x + y\text{.}$$

3. Let $$x$$ and $$y$$ be rational numbers, such that $$0 \lt x \lt y \lt 1\text{.}$$

Then $$xy$$

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$$x + y\text{.}$$

4. Let $$x$$ and $$y$$ be integers, such that $$x \lt y\text{.}$$

Then $$x + 2y$$

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$$2x + y\text{.}$$

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