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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