Có tất cả 3 góc.

Đó là : góc BAC ; góc BAD ; góc CAD

0,5 x - \(\frac{2}{3}\)x = \(\frac{5}{12}\)

( 0,5 . \(\frac{2}{3}\)) x = \(\frac{5}{12}\)

\(\frac{1}{3}\)x =\(\frac{5}{12}\)

x = \(\frac{5}{12}\): \(\frac{1}{3}\)

x = \(\frac{5}{4}\)

Vậy x = \(\frac{5}{4}\)

a. ( - 37 ) + ( - 112 )

= - ( 37 + 112 )

= - 149

b. ( - 42 ) + 52

= ( 52 - 42 )

= 10

c. 13 - 31

= 13 + ( - 31 )

= - ( 31 - 13 )

= - 18

a. 3784 + 23 - 3784 - 15

= 3784 - 3784 + 23 - 15

= ( 3784 - 3784 ) + ( 23 - 15 )

= 0 + 8

= 8

b. 21 + 22 + 23 + 24 - 11 - 12 - 13 - 14

= ( 21 - 11 ) + ( 22 - 12 ) + ( 23 - 13 ) + ( 24 - 14 )

= 0 + 0 + 0 + 0

= 0

4.

I'm sorry because not phoning you last night. I completely forgot.

Mình nhấn nhầm

They are rich so they don't have to work.

Chúc bạn học tốt!!!

How long are they going to stay there?

- For a week.