a) 4 + 2/7 b) 7/8 + 1 c)5/6 + 3

2 câu trả lời

`a)`

   `4 + 2/7`

`= 28/7 + 2/7`

`= {28 + 2}/7`

`= 30/7`

`b) `

   `7/8 + 1`

`= 7/8 + 8/8`

`= { 7 + 8 }/8`

`= 15/8`

`c)`

   `5/6 + 3`

`= 5/6 + 18/6`

`= { 5 + 18 }/6`

`= 23/6`

$a,$ $4$ $+$ `\frac{2}{7}`

$=$ `\frac{28}{7}` `+` `\frac{2}{7}`

$=$ `\frac{28+2}{7}`

$=$ `\frac{30}{7}`

$b,$ `\frac{7}{8}` `+` `1`

$=$ `\frac{7}{8}` `+` `\frac{8}{8}`

$=$ `\frac{7+8}{8}`

$=$ `\frac{15}{8}`

$c,$ `\frac{5}{6} + 3`

$=$ `\frac{5}{6}` `+` `\frac{18}{6}`

$=$ `\frac{5 + 18}{6}`

$=$ `\frac{23}{6}`

$Táo ^^$

 

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