cho tui hỏi vào đề hôm nay tui thi chứng minh 7n+5/10n + 7
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hoi an is one of the (1)...... towns in Viet Nam.It (2)....... on the lower section of the Thu Bon river. It is a very beautiful town with a lot of colorful(3)..... which are hung(4).... the town. Hoi An is famous for one-(5)......tailoring.Customers order clothes (6)....... the morning and get them i the (7)....... . The price is not really (8)....... if you want to find the place of the (9)..... time, Hoi An is a (10)..... choice.
1/ A newer B newest C oldest
2/ A are B is C are being
3/ A lanterns B stars C ballons
4/ A on B around C up
5/ A month B week C day
6/ A at B in C on
7/ A night B afternoon C evening
8/ A expensive B cheap C more expensive
9/ A modern B old C new
10/ A best B worst C good





a. ta có \(\frac{219}{220}=1-\frac{1}{220}>1-\frac{1}{216}=\frac{215}{216}\)nên \(\frac{219}{220}>\frac{215}{216}\)
b. \(-\frac{1999}{2000}=\frac{1}{2000}-1>\frac{1}{2001}-1=-\frac{2000}{2001}\text{ nên }-\frac{1999}{2000}>-\frac{2000}{2001}\)
c. \(\frac{403}{407}=1-\frac{4}{407}< 1-\frac{4}{847}=\frac{843}{847}\text{ nên }\frac{403}{407}< \frac{843}{847}\)
d. \(-\frac{251}{138}=-2+\frac{25}{138}>-2+\frac{25}{171}=-\frac{317}{171}\text{ nên }-\frac{251}{138}>-\frac{317}{171}\)