Câu `1`: `4``5/8` `= 37/8`
`->` `B.`
Câu `2`: `35/9 = 3``8/9`
`->` `C.`
`a)` `4``5/8` `>` `4``3/8`
`b)` `5``2/3` `<` `5``6/9`
`c)` `12``7/9` `<` `12``7/8`
`d)` `7``7/9` `=` `8``1/3`
Câu `3`:
`a)` `2``3/5` `+ 3``1/2`
`=>` `13/5 + 7/2 = 26/10 + 35/10 = 61/10`
`b)` `4``1/2` `- 2``2/3`
`=>` `9/2 - 8/3 = 27/6 - 16/6 = 11/6`
`c)` `1``3/4` `xx 2``2/3`
`=>` `7/4 xx 8/3 = 56/12 = 28/6`
`d)` `2``3/4 : 1``1/3`
`=>` `11/4 : 4/3 = 11/4 xx 3/4 = 33/16`
Câu `4`:
`a)` `9/10 xx 5 = 4``1/2`
`9/10 xx 5 = 9/2`
`b)` `5/2 : 2 = 1``1/4`
`5/2 : 2 = 5/4`