Câu 2:
A , 2+`3/5`=`13/5`
`2/1` + `3/5` = `13/5`
`10/5` + `3/5` = `13/5` ( Đ)
B , `5/6` : `2` = `10/6`
`5/6` : `2/1` = `10/6`
`5/6` x `1/2` = `5/12` ( S )
C , `1` - `12/15` = `3/15`
`15/15` - `12/15` = `3/15` ( Đ)
D , `3` x `1/2` = `1/6`
`3/1` x `1/2` = `1/6`
` ( 3x1)/(1x2)`=`3/2` --> `3` x `1/2` = `1/6` ( S )
Câu 3:
3`1/2`=`(3x2+1)/2`=`7/2`
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`105/100`=(105:100)=1 và dư 5
--> `105/100`=1`5/100`
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14`2/3`=`(14x3+2)/3`=`44/3`
