\(\frac{2019}{210}+\frac{2019}{280}+\frac{2019}{360}+\frac{2019}{450}+\frac{2019}{550}\)

\(=\frac{673}{70}+\frac{2019}{280}+\frac{673}{120}+\frac{673}{150}+\frac{2019}{550}\)

\(=\left[\frac{673}{70}+\frac{2019}{280}\right]+\frac{673}{120}+\frac{673}{150}+\frac{2019}{550}\)

\(=\left[\frac{2692}{280}+\frac{2019}{280}\right]+\frac{673}{120}+\frac{673}{150}+\frac{2019}{550}\)

\(=\frac{673}{40}+\frac{673}{120}+\frac{673}{150}+\frac{2019}{550}\)

\(=\left[\frac{673}{40}+\frac{673}{120}\right]+\frac{673}{150}+\frac{2019}{550}\)

\(=\left[\frac{2019}{120}+\frac{673}{120}\right]+\frac{673}{150}+\frac{2019}{550}\)

\(=\frac{673}{30}+\frac{673}{150}+\frac{2019}{550}\)

\(=\left[\frac{673}{30}+\frac{673}{150}\right]+\frac{2019}{550}\)

\(=\frac{673}{25}+\frac{2019}{550}=\frac{14806}{550}+\frac{2019}{550}=\frac{16825}{550}=\frac{673}{22}\)

P/S : Các a chị check dùm em ạ

a) Ta có:

\(\begin{array}{l}{360^ \circ } = 360.\frac{\pi }{{180}} = 2\pi \\ - {450^ \circ } = 450.\frac{\pi }{{180}} = \frac{5}{2}\pi \end{array}\)

b)\(3\pi  = 3\pi .{\left( {\frac{{180}}{\pi }} \right)^ \circ } = {540^ \circ }\)

\( - \frac{{11\pi }}{5} = \left( { - \frac{{11\pi }}{5}} \right).{\left( {\frac{{180}}{\pi }} \right)^ \circ } =  - {396^ \circ }\)

560+450+360

=1010+360

=1370

bạn tk mk trước đi.

560 + 460 + 360

= 1020 + 360

= 1380

1370

tk mình đi xin cậu đấy  tk nha nha nha nha nha nha nha nha

A = 450 + 550 = 1000. 

B = 360 + 640 = 1000.

A + B = 1000 + 1000 = 2000.

Đúng 100% luôn!

Ai tk cho mình mình tk lại.

A= 1000

B=1000

A+B=2000

Ai k mình mình k lại hứa yên tâm!

A + B = 2000 nha bạn. Vì mỗi cái 1000

200 + 500 = 700

500 + 500 = 1000

360 + 450 =810

700

100

810

200 + 500 = 700

500 + 500 = 1000

360 + 450 = 810

Ta có 360 ⋮ a; 135 ⋮ a; 450 ⋮ a và a là số lớn nhất có thể

=> \(a\inƯCLN\left(360,135,450\right)\in\left\{45\right\}\)

Vậy a = 45