Tìm x
a,(x+3/5):4/3=5/6
b,x.1212/1515-x.1919/2020=6/-5
Tính nhanh
a,-17/18.3/7-17/18.4/7
b,7777/8888.13/17+7/8.4/17
Tính
a,(-3/4+2/5):4/15+(3/4-4/5).5/2
Tìm x a,(x+3/5):4/3=5/6 b,x.1212/1515-x.1919/2020=6/-5 Tính nhanh a,-17/18.3/7-17/18.4/7 b,7777/8888.13/17+7/8.4/17 Tính a,(-3/4+2/5):4/15+(3/4-4/5).
By Nevaeh
Bạn xen hình
$a$) `(x + 3/5) : 4/3 = 5/6`
`⇔ x+ 3/5 = 10/9`
`⇔ x = {23}/45`
Vậy `x = 23/45`
$b$) `x. 1212/1515-x. 1919/2020=6/-5`
`⇔ x (12/15 – 19/20) = -6/5`
`⇔ x . {-3}/20 = -6/5`
`⇔ x = 8`
Vậy `x=8`
$a$) `-17/18. 3/7-17/18 .4/7`
`= -17/18 . (3/7 + 4/7)`
`= -17/18`
$b$) `7777/8888. 13/17+7/8. 4/17`
`= 7/8 . (13/17 + 4/17)`
`=7/8`
$a$) `(-3/4+2/5):4/15+(3/4-4/5).5/2`
`= -21/16 – 1/8`
`= {-23}/16`