Bài 1 : Tính
a ) 3/5 × 2/7 : 4/9 d ) 4 3/8 + 5 2/3 – 8 5/24
b ) 2/11 : 1/3 × 3/2 e ) 1/2 + 1/4 : 1/6
c ) 5/2 × 1/3 + 1/4 f ) ( 5/2 + 1/3 ) : ( 1 – 2/3 )
Bài 2 : Tìm x biết :
a ) x – 3/4 = 6 × 3/8
b ) 7/8 : x = 3 – 1/2
c ) x + 1/2 × 1/3 = 3/4
Các bạn giúp mik với mik đag cần gấp
Bài 1 : Tính
a ) 3/5 × 2/7 : 4/9 b ) 2/11 : 1/3 × 3/2
=6/35 : 4/9 =6/11 × 3/2
=27/70 =9/11
c ) 5/2 × 1/3 + 1/4 d ) 4 3/8 + 5 2/3 – 8 5/24
=5/6+1/4 =545/24-85/24
=13/12 =115/6
e ) 1/2 + 1/4 : 1/6 f ) ( 5/2 + 1/3 ) : ( 1 – 2/3 )
=1/2+3/2 =17/6:1/3
=2 =17/2
Bài 2 : Tìm x biết :
a ) x – 3/4 = 6 × 3/8 b ) 7/8 : x = 3 – 1/2
x – 3/4=9/4 7/8 : x =5/2
x=9/4+3/4 x= 7/8÷5/2
x=3 x=7/20
c ) x + 1/2 × 1/3 = 3/4
x+1/6=3/4
x=3/4-1/6
x=7/12
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`Bài 1` :
`a ) 3/5 × 2/7 : 4/9`
`=6/35 : 4/9`
`=54/140`
`=27/70`
`b ) 2/11 : 1/3 × 3/2`
`=6/11 × 3/2`
`=18/22`
`=9/11`
`c ) 5/2 × 1/3 + 1/4`
`=5/6 + 1/4`
`=13/12`
`d ) 4 3/8 + 5 2/3 – 8 5/24`
`=35/8 + 17/3 – 197/24`
`=241/24 – 197/24`
`=44/24`
`=11/8`
`e ) 1/2 + 1/4 : 1/6`
`=1/2 + 6/4`
`=1/2 + 3/2`
`=4/2`
`=2`
`f ) ( 5/2 + 1/3 ) : ( 1 – 2/3 )`
`=17/6 : 1/3`
`=17/6 : 2/6`
`=17/2`
`Bài 2 :`
`a ) x – 3/4 = 6 × 3/8`
`x – 3/4 = 18/8`
`x – 3/4 = 9/4`
`x = 9/4 + 3/4`
`x = 12/4`
`x = 3`
Vậy `x = 3`
`b ) 7/8 : x = 3 – 1/2`
` 7/8 : x = 5/2`
`x = 7/8 ÷ 5/2`
`x = 14/40`
`x =7/20`
`c ) x + 1/2 × 1/3 = 3/4`
`x + 1/6 = 3/4`
`x = 3/4 – 1/6`
`x = 18/24 – 4/24`
`x = 14/24`
`x = 7/12`
`#STUDY WELL`