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)

0 bình luận về “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)”

1. 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

    

   Trả lời

2. 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`

   Trả lời