Cho \(\Delta\)aBC, aB < aC, D nam giua a va C sao cho a\(\widehat{BD}\)= a\(\widehat{CB}\)
a) C/m: \(\Delta\)aDB \(\sim\) \(\Delta\) aBC. Từ đó suy ra aB\(^2\) = aC . aD
b) Biết diện tích tam giac aBC = 16cm\(^2\) . aB = 6cm, aC = 8cm. Tính S tam giac aBD
c) Tia phan giac cua góc a cat BC taị E, cat BD taị E. C/m: \(\frac{FD}{FB}=\frac{EB}{EC}\)
D) Ua a kẻ đường thang vuông góc với Ea cat BC taị M. C/m: MB.EC = MC.EB

Giaỉ phương trình:
\(\frac{2\left|x-3\right|}{x^2+2x-15}=1\)

1. You should have waited for us" the team leader said to John
-> The team leader criticized ...................................
2. adele tries hard, but she doesn't get anywhere
-> However ........................................
3. That's the strangest film I've ever seen
-> I've never ...........................................
4. Walking home alone is not good idea
-> You .................................................
5. She is proud of being such a good cook
-> She prides ................................................
6. I watches them leave. I will never forget it.
-> I will ........................................................
7. "What time does the delegation come?"
-> The manager wanted .........................
8. I expected them to offer me that job.
-> I expected ...............................................