Tính a) (-3/4 + 2/5) : 3/7 + ( 3/5 + -1/4):3/7 b) 7/8 : (2/9-1/18)+7/8:(1/16-5/12) 10/09/2021 Bởi Aaliyah Tính a) (-3/4 + 2/5) : 3/7 + ( 3/5 + -1/4):3/7 b) 7/8 : (2/9-1/18)+7/8:(1/16-5/12)
a) (-3/4 + 2/5) : 3/7 + ( 3/5 + -1/4):3/7 =-7/20:3/7+7/20:3/7 =(-7/20+7/20):3/7 =-1/4:3/7 =-7/12 b) 7/8 : (2/9-1/18)+7/8:(1/16-5/12) =7/8:1/6+7/8:-17/48 =7/8:(1/6+-17/48) =7/8:-3/16 =-14/3 Bình luận
a, `( (-3)/4 + 2/5 ) : 3/7 + ( 3/5 + (-1)/4 ) : 3/7` `= [ ( (-3)/4 +2 /5 ) + ( 3/5 + (-1)/4 ) ]: 3/7` `= [ ( (-3)/4 + (-1)/4 ) + ( 2 /5 + 3/5 ) . 7/3` `= ( -1 + 1 ) . 7/3` `= 0 . 7/3` `= 0` b, `7/8 : ( 2/9 – 1/18 ) + 7/8 : ( 1/16 – 5/12 )` `= 7/8 : [ ( 2/9 – 1/18 ) + ( 1/16 – 5/12 ) ]` `= 7/8 : [ ( 4/18 – 1/18 ) + ( 3/48 – 20/48 ) ]` `= 7/8 : [ 1/6 + ( -17 )/48 ]` `= 7/8 : [ 8/48 – 17/48 ]` `= 7/8 : (-9)/48` `= 7/8 . (-48)/9` `= (-14)/3` $\text{HỌC TỐT NHA ~}$ $\text{#NOCOPY}$ `#Sâu` Bình luận
a) (-3/4 + 2/5) : 3/7 + ( 3/5 + -1/4):3/7
=-7/20:3/7+7/20:3/7
=(-7/20+7/20):3/7
=-1/4:3/7
=-7/12
b) 7/8 : (2/9-1/18)+7/8:(1/16-5/12)
=7/8:1/6+7/8:-17/48
=7/8:(1/6+-17/48)
=7/8:-3/16
=-14/3
a, `( (-3)/4 + 2/5 ) : 3/7 + ( 3/5 + (-1)/4 ) : 3/7`
`= [ ( (-3)/4 +2 /5 ) + ( 3/5 + (-1)/4 ) ]: 3/7`
`= [ ( (-3)/4 + (-1)/4 ) + ( 2 /5 + 3/5 ) . 7/3`
`= ( -1 + 1 ) . 7/3`
`= 0 . 7/3`
`= 0`
b, `7/8 : ( 2/9 – 1/18 ) + 7/8 : ( 1/16 – 5/12 )`
`= 7/8 : [ ( 2/9 – 1/18 ) + ( 1/16 – 5/12 ) ]`
`= 7/8 : [ ( 4/18 – 1/18 ) + ( 3/48 – 20/48 ) ]`
`= 7/8 : [ 1/6 + ( -17 )/48 ]`
`= 7/8 : [ 8/48 – 17/48 ]`
`= 7/8 : (-9)/48`
`= 7/8 . (-48)/9`
`= (-14)/3`
$\text{HỌC TỐT NHA ~}$
$\text{#NOCOPY}$
`#Sâu`