Nhi có: 20-3=17(cái)

Hai bn có: 20+17=37(cái)

ĐS: 37 cái kẹo

Do want to be fitter and healthier? Would you like to look younger? Do you want to feel ...........(1) relaxed? Then try a few days at a health farm. Health farms are becoming ...........(2) of the most popular places ...........(3) a short break. I went to Henley Manor for a weekend. It's ...........(4) largest health farm in the coutry ...........(5) it isn't the most expensive. After two day of exercise I ...........(6) ten time better. But the best thing for me was the food. It was all very healthy, of ...........(7), but it was excellent, too!

If you're looking for something a ...........(8) cheaper, try a winter break. Winter is the darkest and the coldest ...........(9) of the year, and it can also be the worst time for your body. We all it too ...........(10) and we don't take enough execise. A lot of heath farm offer lower prices monday to friday from november to march

Thu gọn rồi tính giá trị biểu thức

a) M=x^3-9x^2+27x-27 tại x=5

b) N=x^2-y^2 tại x=53, y=3

c) P=4x^2-28+49 tại x=4

a. 4x(x+1)-5(x+1)=0

b. 5x(x-20)+5x-100=0

c. 2(x-2)+(x-2)^2=0

d. (x-3)^2-5x-x^2=12

1. She often feels ........... when she get bad marks. (happy)

2. My stomatchache ........... after I took the tablets. (appear)

3. My favourite subject at school is physical ............ (educate)

4. Catching the common cold is ........... for everything. (please)

5. Do you know that video games may be ...........? (addict)

6. Hoa is the most ........... girl in her class. (beauty)

7. My father has a ........... computer. He often brings it with him when he's away on business. (port)

8. Some of children ........... boys, play marbles when there is a break. (main)

9. My sister has a big ........... of stamps. (collect)

10. I have ........... time to play than my friends. (little)

Tại sao Trưng Trắc được lên ngôi, còn Trưng Nhị lại không ??

Triệu Đà có được tính là một vị vua của nước ta không ??