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tự luận
1) `-5/3` + `1/2` : `3/4`
=`-5/3` + `2/3`
= `-3/3`
= -1
b) `-3/7` - `4/9` + `10/7` - `23/9` + `2/3`
= ( `-3/7` + `10/7`) - ( `4/9` + `23/9`) + `2/3`
= `7/7` - `27/9` + `2/3`
= `1` - `3` + `2/3`
= -2 + `2/3`
= `-4/3`
c)`9/4` : ( -3,5) + `9/4` . 2`2/7`
= `9/4` . `-2/7` + `9/4` . `16/7`
= `9/4` . ( `-2/7` + `16/7`)
= `9/4` . 2
= `9/2`