(19+n)/(5+n)=7/6.
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a) m/n = 7/6 - 2/3
m/n = 1/2
b) m/n = 9/7 - 2/5
m/n = 31/35
c) m/n = 8/9 : 3
m/n = 8/27
d) m/n = 14/19 : 42/38
m/n = 2/3
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Ta có: (19+n)/(5+n)=7/6
<=>(19+n).6=(5+n).7
<=> 114+6n=35+7n
<=>6n-7n=35-114
<=>-n=-79
=>n=79
vậy n=79