`5/6×16/19-(-5/6)×3/19-11/6`

`=5/6×16/19+ 5/6 ×3/19-11/6`

`=5/6 xx(16/19 + 3/19) -11/6`

`= 5/6 xx 1 -11/6`

`= 5/6-11/6`

`= -1`

-1210/1767

\(x=-7\)

A = 6/19 x -7/11 + 6/19 x -4/11 + -13/19

A = (6/19 x -7/11 + 6/19 x -4/11) + -13/19

A = (6/19 x (-7/11 + -4/11)) + -13/19

A = (6/19 x -11/11) + -13/19

A = (6/19 x -1) + -13/19

A = -6/19 + -13/19

A = -19/19

A = -1

\(\sqrt{\left(19-6\sqrt{2}\right)}+\sqrt{\left(19+6\sqrt{2}\right)}\)

\(=\sqrt{\left(3\sqrt{2}-1\right)^2}+\sqrt{\left(3\sqrt{2}+1\right)^2}\)

\(=\left|3\sqrt{2}-1\right|+\left|3\sqrt{2}+1\right|\)

\(=\left(3\sqrt{2}-1\right)+\left(3\sqrt{2}+1\right)=6\sqrt{2}\)

19 x 1 = 19

19 x 2 = 38

19 x 3 = 57

19 x 4 = 76

19 x 5 = 95

19 x 6 = 114

19 x 7 = 133

19 x 8 = 152

19 x 9 = 172

19 x 10 = 190

Hok tốt ah

19

38

57

76

95

114

133

152

171

190

MẸO HEN 

NẾU DÒNG THẲNG TẮP NHƯ VẦY 

9 x 1

9 x 2

9 x 3

9 x 4

9 x 5

9 x 6

9 x 7 6 3

9 x 8 7 2

9 x 9 8 1

9 x 1=9 0

\(B=\dfrac{6}{19}\cdot\dfrac{-7}{11}+\dfrac{6}{19}\cdot\dfrac{-4}{11}+\dfrac{-13}{19}\)

\(B=\dfrac{6}{19}\cdot\left(-\dfrac{4}{11}+\dfrac{-7}{11}\right)+\dfrac{-13}{19}\)

\(B=\dfrac{6}{19}\cdot\left(-1\right)+\dfrac{-13}{19}\)

\(B=-\dfrac{6}{19}+\dfrac{-13}{19}=-\dfrac{19}{19}=-1\)

Vậy \(B=-1\)

63 / 19

=\(\frac{63}{19}\)nhé