a) Cho các số nguyên dương x, y nguyên tố cùng nhau. Chứng minh rằng phân số $\frac{a}{b}=\frac{x\left(2017+y\right)}{2018x+y}$tối giản

b) Cho $P=\frac{{2018}^{100}+{2018}^{96}+{2018}^{92}+...+{2018}^4+1}{{2018}^{102}+{2018}^{100}+{2018}^{98}+...+{2018}^2+1}$.  Chứng minh rằng $4P<{\left(0,1\right)}^6$

Đề đúng là 
2\(^x\) + 3.2\(^{x+2}\)= 39 - 2\(^{x-1}\)

The city of Patras is on the west coast of Greece.
Every year Patras has a carnival that starts (1)
_________ January or February. Patras Carnival
(2) _________ lasts for about three weeks. The
carnival is a very old tradition in Patras and has
more than 160 years of history. It is one of the
largest carnivals in the (3) _________. Thousands of people visit the carnival every year.
At the carnival, you can listen to live music and see performances in the streets every day.
People dance in the city squares and there (4) _________ fireworks after dark. In the final
week of the carnival, there is a big parade with performers and music. There is also another
carnival just for children. There is entertainment for the children,
competitions and it even has its (5) _________ parade.
1. A. on B. in C. to D. from
2. A. use B. usual C. usually D. uses to
3. A. globe B. world C. planet D. Earth
4. A. were B. was C. is D. are
5. A. own B. owned C. owner D. ownership

0,56x7,8+22x0,44

= 4.368 + 9,68

=14.048

\(\dfrac{1}{3}\)