Tìm x :
a) x + 7/12 = 17/18 - 1/9
x + 7/12 = 15/18
x = 15/18 - 7/12
x = 31/36
mik nè
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=30/36 -21/36
x=9/36 =1/4
b)29/30 -(13/23+x)=7/69
(13/23+x)=29/30-7/69
(13/23+x)=199/230
x=199/230-13/23
x=3/10