a) = 1192

b) = 1350

Gọi giao điểm của EC và BD là K

Xét  \(\Delta DKC\) có:

\(\widehat{KDC}+\widehat{DCK}+\widehat{DKC}=180^o\)

\(\Rightarrow90^o+25^o+\widehat{DKC}=180^o\)

\(\Rightarrow\widehat{DKC}=180^o-90^o-25^o\)

\(\Rightarrow\widehat{DKC}=65^o\)

mà \(\widehat{CKD}=\widehat{BKE=65^o}\) (2 góc đối đỉnh)

Xét \(\Delta EKB\) có:

\(\widehat{KEB}+\widehat{EKB}+\widehat{EBK}=180^o\)

\(\Rightarrow90^o+65^o+x=180^o\)

\(\Rightarrow x=180^o-90^o-65^o\)

\(\Rightarrow x=25^o\)

1. Going in the rain is interesting.

2. Don't forget to learn by heart new words.

3. If he doesn't apologize me, I won't forgive him.

4. My grandmother is the most helpful (person) in my village.

5. What is the price of that hat?

6. Your book is different from my book.

6. D

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