1Tim x
a) x + 7/12= 17/18 – 1/9 ; 29/30 – ( 13/23 + x ) = 7/9
1Tim x a) x + 7/12= 17/18 – 1/9 ; 29/30 – ( 13/23 + x ) = 7/9
By Josephine
By Josephine
1Tim x
a) x + 7/12= 17/18 – 1/9 ; 29/30 – ( 13/23 + x ) = 7/9
Giải thích các bước giải:
`a)`
`x+7/12=17/18-1/9`
`=>x+7/12=17/18-2/18`
`=>x+7/12=15/18`
`=>x=15/18-7/12`
`=>x=1/4`
Vậy `x=1/4`
`b)`
`29/30-(13/23+x)=7/9`
`=>13/23+x=29/30-7/9`
`=>13/23+x=117/90-70/90`
`=>13/23+x=47/90`
`=>x=47/90+13/23`
`=>x=2251/2070`
Vậy `x=2251/2070`
Giải thích các bước:
a) x + 7/12= 17/18 – 1/9
x+7/12=15/18
x=15/18-7/12
x=30/36-21/36
x=9/36=1/4
Vậy x=1/4
29/30 – ( 13/23 + x ) = 7/9
(13/23+x)=29/30-7/9
(13/23+x)=87/90-70/90
(13/23+x)=17/90
x=13/23-17/90
x=1170/2070-391/2070
x=779/2070