$#Đáp án+Giải thích các bước giải:$
`a)`
`6 3/8 + 5 1/2`
`+` C `1:`
`= 51/8 + 11/2`
`= 51/8 + 44/8`
`= 95/8`
`+` C `2:`
`= ( 6+5 ) + ( 3/8 + 1/2 )`
`= 11 + ( 3/8 + 4/8 )`
`= 11 + 7/8`
`= 88/8 + 7/8`
`= 95/8`
-------------------------------------------------
`b)`
`5 3/7 -2 3/7`
`+` C `1:`
`= 38/7 - 17/7`
`= 21/7`
`= 3`
`+` C `2:`
`= ( 5-2 ) - ( 3/7 - 3/7 )`
`= 3 - 0`
`= 3`
----------------------------------------------------
`c)`
`-5 1/7 + 3 2/5`
`+` C `1:`
`= -36/7 + 17/5`
`= -180/35 + 119/35`
`= -61/35`
`+` C `2:`
`= ( -5+3 ) + (-1/7 + 2/5)`
`= -2 + ( -5/35 + 14/35 )`
`= -2 + 9/35`
`= -70/35 + 9/35`
`= -61/35`
---------------------------------------------------
`d)`
`-2 1/3 - 1 2/7`
`+` C `1:`
`= -7/3 - 9/7`
`= -49/21 - 27/21`
`= - 76/21`
`+` C `2:`
`= ( -2-1)+ ( -1/3 - 2/7 )`
`= -3 + ( -13/21 )`
`= -76/21`
$#Cam$
$#XIN HAY NHẤT CHO NHÓM AK$
