`a``)` `3``+``6``-``2``<``7``+``1``<``10``-``1``+``0`
`b``)` `7``+``2``-``4``<``9``-``3``<``4``+``5``-``2`
Giải thích:
`a``)` `7` `<``7``+``...` `<` `9`
`⇒` `7` `<``7``+``1` `<` `9`
`⇒` `7` `<``8` `<` `9`
`b``)` `5``<``...``-``3``<``7`
`⇒``5``<``9``-``3``<``7`
`⇒``5``<``6``<``7`