Bác Mai đi chợ mua rau và cam. Biết rằng mỗi túi rau có giá 10 000 đồng và cam có giá 50 000 đồng /kg
a) Viết biểu thức biểu thị tổng số tiền bác Mai phải trả nếu mua x túi rau và y(kg) cam.
b) Nếu bác Mai mua 3 túi rau và 2kg cam thì bác Mai phải trả bao nhiêu tiền?

3(x-3)+2(3x-4)=0

\(-x^2+16=0\)

38. The Beastle is my favorite musical band. I love all their performance. ( synonym )
A. display                  B. show                      C. presentation         D. preparation

6. It’s a good idea to switch off electrical appliances when they aren’t in use.

-> You………………………..

7. Although coal is the most polluting of fossil fuels, it is still the largest sources of energy worldwide.

-> However……………………………..

9. This is our school.

àThis school is ……………………………..………………………………….…

23. ________ the film was gripping, Tom slept from beginning to end.
A. Therefore       B. Despite                              C. However                           D. Although
24. Coal is a   __________ energy.
A. nuclear                  B. solar                                  C. biogas                            D. natural
25.She’s sure that they will find the film_________.
A. entertaining                B. entertain               C. entertainment                   D. entertained
26. I __________go on foot when I was in primary school.
A. used to                  B. break                                 C. can                         D. may