xy(x+2)(y+2)=9 và x^2+y^2+2(x+y)

Cho tam giác ABC vuông tại A,Đường phân giác AD,biết AB=6cm,BC=10cm.Tính BD,CD

một hộp chứa 3 viên bi xanh 5 viên bi đỏ và 6 viên bi vàng có kích thước và khối lượng giống nhau.Lấy ra ngẫu nhiên 1 viên bi từ hộp.Tính xác suất của biến cố A:viên bi lấy ra không có màu vàng

CMR:(x^2+x-1)^10+(x^2-x+1)^10-2 \(⋮\left(x^2-x\right)\)

17/ My parents are watching TV now.

18/ Hai and I will play games online this evening.

19/ I am helping Hoa and Lan with doing homework  at the present.

20/ My dad was watering the garden while my mum was cooking dinner.

21/ He will show the guitar tomorrow evening.

22/ My little son can draw the dog.

23/ You should study lessons well before going to class.

24/ They can play volleyball very well.

25/ When did they decorate your kitchen?

26/ You must obey all the rules of transportation when you are driving.

27/ My dad is going to buy me a new bike.

28/ Are You going to study French.

29/ Lan will help me with making cakes.

30/ Lan is going to help her younger sister  do homework.

15/ Yesterday, I was reading books when she came.

16/ Next month, I shall finish this book.