a: 12h: 0 độ

10h: 60 đọ

6h: 180 độ

5h: 150 độ

b: 

a: góc nhọn: góc yMz; góc tMz

b: góc vuông: góc yMt, góc xMt

c: góc tù: góc xMz

d: góc bẹt: góc xMy

mình cũng muốn biết ai có thể làm được bài này ạ

\(a, \dfrac{-3}{7}-\left(\dfrac{5}{9}-\dfrac{3}{7}\right) \)
\(=\dfrac{-3}{7}-\dfrac{5}{9}+\dfrac{3}{7}\)
\(=\dfrac{-3}{7}+\dfrac{3}{7}-\dfrac{5}{9}\)
\(=0-\dfrac{5}{9}\)
\(=\dfrac{-5}{9}\)

`a)` 

`-3/7-(5/9-3/7)`

`=-3/7-5/9+3/7`

`=(-3/7+3/7)+(-5/9)`

`=0+(-5/9)=-5/9`

`b)`

`=5/7(2/11+3/11-1(5)/11)`

`=5/(7).(-1)`

`=-5/7`

`@Shả`

\(b,\dfrac{2}{11}.\dfrac{5}{7}+\dfrac{5}{7}.\dfrac{3}{11}-\dfrac{5}{7}.1\dfrac{5}{11}\)
\(=\dfrac{2}{11}.\dfrac{5}{7}+\dfrac{5}{7}.\dfrac{3}{11}-\dfrac{5}{7}.\dfrac{16}{11}\)
\(=\dfrac{5}{7}.\left(\dfrac{2}{11}+\dfrac{3}{11}-\dfrac{16}{11}\right)\)
\(=\dfrac{5}{7}.\left(\dfrac{5}{11}-\dfrac{16}{11}\right)\)
\(=\dfrac{5}{7}.\left(-1\right)\)
\(=\dfrac{-5}{7}\)

a: =-3/7-5/9+3/7=-5/9

b: \(=\dfrac{5}{7}\left(\dfrac{2}{11}+\dfrac{3}{11}-\dfrac{16}{11}\right)=\dfrac{-5}{7}\)

c: \(=\dfrac{5}{4}-\dfrac{1}{4}\cdot\dfrac{-16}{3}+1=\dfrac{9}{4}+\dfrac{4}{3}=\dfrac{43}{12}\)