-I-5I+(-19)+18+I11-4I-57

=-5+(-19)+18+7-57

=-24+18+7-57

=-6+7-57

=1-57

=-56 

\(-\left|-5\right|+\left(-19\right)+\left(+18\right)+\left|11-4\right|-57\)

\(=-5+\left(-19\right)+18+7-57\)

\(=-24+18+\left(7-57\right)\)

\(=-6+\left(-50\right)\)

\(=-56\)

- | - 5 | + ( - 19 ) + ( + 18 ) + | 11 - 4 | - 57

= - 5 + ( - 19 ) + 18 + | 7 | - 57

= - 24 + 18 + 7 - 57

= - 6 + 7 - 57

= 1 - 57

= - 56

-2/5 - 3/7 + 10/7 - - 7/5

= ( -2/5 -- 7/5 ) + ( -3/7 + 10/7 ) 

= ( -2/5 + 7/5 ) + 7/7

=       5/5 + 7/7

=        1 + 1 

= 2 

Tk mk nha !!! 

= -2/5 - 3/7 + 10/7 + 7/5

= ( -2/5 + 7/5 ) + ( 10/7 - 3/7 )

= 5/5 + 7/7 

= 1 + 1 = 2

chúc bạn học tốt nhé!!!

a) \(\frac{{ - 3}}{7}.\frac{2}{5} + \frac{2}{5}.\left( { - \frac{5}{{14}}} \right) - \frac{{18}}{{35}}\)

\(\begin{array}{l} = \frac{2}{5}.\left( {\frac{{ - 3}}{7} + \frac{{ - 5}}{{14}}} \right) - \frac{{18}}{{35}}\\ = \frac{2}{5}.\left( {\frac{{ - 6}}{{14}} + \frac{{ - 5}}{{14}}} \right) - \frac{{18}}{{35}}\\ = \frac{2}{5}.\frac{{ - 11}}{{14}} - \frac{{18}}{{35}} = \frac{{ - 11}}{{35}} - \frac{{18}}{{35}} =  \frac{{ -29}}{{35}}\end{array}\)

b) \(\left( {\frac{2}{3} - \frac{5}{{11}} + \frac{1}{4}} \right):\left( {1 + \frac{5}{{12}} - \frac{7}{{11}}} \right)\)

\(\begin{array}{l} = \left( {\frac{{2.11.4}}{{3.11.4}} - \frac{{5.3.4}}{{11.3.4}} + \frac{{1.3.11}}{{4.3.11}}} \right):\left( {\frac{11.12}{11.12} + \frac{{5.11}}{{12.11}} - \frac{{7.12}}{{11.12}}} \right)\\ = \left( {\frac{{88 - 60 + 33}}{{121}}} \right):\left( { \frac{{121+55 - 84}}{{121}}} \right)\\ = \frac{{61}}{{121}}:\frac{{92}}{{121}} = \frac{{61}}{{121}}.\frac{{121}}{{92}}= \frac{{61}}{{92}}\end{array}\)

c) \(\left( {13,6 - 37,8} \right).\left( { - 3,2} \right)\)

\( = \left( { - 24,2} \right).\left( { - 3,2} \right) = 77,44\)

d) \(\left( { - 25,4} \right).\left( {18,5 + 43,6 - 16,8} \right):12,7\)

\(\begin{array}{l} = \left( { - 25,4} \right).\left( {62,1 - 16,8} \right):12,7\\ = \left( { - 25,4} \right).45,3:12,7\\ = \left( { - 25,4} \right):12,7.45,3\\ =  (- 2).45,3 =  - 90,6\end{array}\)

a: \(=\dfrac{2}{5}\cdot\left(-\dfrac{3}{7}-\dfrac{5}{14}\right)-\dfrac{18}{35}\)

\(=\dfrac{2}{5}\cdot\dfrac{-6-5}{14}-\dfrac{18}{35}\)

\(=\dfrac{2}{5}\cdot\dfrac{-11}{14}-\dfrac{18}{35}=-\dfrac{22}{70}-\dfrac{18}{35}=\dfrac{-58}{70}=-\dfrac{29}{35}\)

b: \(=\dfrac{88-60+33}{132}:\dfrac{132+55-84}{132}\)

\(=\dfrac{61}{132}\cdot\dfrac{132}{103}=\dfrac{61}{103}\)

c: \(=-24.2\cdot\left(-3.2\right)=24.2\cdot3.2=77.44\)

d: \(=\dfrac{-25.4}{12.7}\cdot45.3=-2\cdot45.3=-90.6\)

câu C đề sai hay sao í

a)=(4.25).37

    =100.37

    =3700

b)=(132+868)+(763+237)+29

   =1000+1000+29

   =2029

c)=7²+[131-1.20]

  =49+[131-20]

  =49+111

  =160

\(\frac{-5}{7}+\frac{-3}{-5}+\frac{5}{7}\)

\(=\left(\frac{-5}{7}+\frac{5}{7}\right)+\frac{-3}{-5}\)

\(=0+\frac{-3}{-5}\)

\(=\frac{-3}{-5}\)

-5/7 + -3/-5 + 5/7

= ( -5/7 + 5/7 ) + -3/-5 

=        0 + -3/-5

=        -3/-5

=     3/5 

= -5/7 + -3/-5 + 5/7 

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

= 0/7 + -3/-5 

=0 + -3/-5

=-3/-5

a,(-123)+|-18|+23+(-18)

= [(-123)+23]+[(-18)+18]

= -100

- Hok tốt ~ K mk nhak.

c,124.23+134.17-40.34

= 124.23+67.2.17-40.34

= 124.23+67.34-40.34

= 124.23+34.27

= 2852+918

= 3770

- Hok tốt ~ K mk nhak

d,325-5.[4^3-(27-5^2):1^18]

= 325-5.[64-(27-25):1]

= 325-5.[64-2]

= 325-5.62

= 325 - 310

= 15

-Hok tốt ~ K mk nnhak.

Dãy trên có số số hạng là:

$\left(2025-1\right)÷2+1=1013$

Tổng của dãy số trên là:

$\left(2025+1\right).1013÷2=1026169$

Đáp số: $1026169$

$mong\; bạn\; tick\; cho\; mik$

Dãy trên có số số hạng là:

$\left(2025-1\right)÷2+1=1013$

Tổng của dãy số trên là:

$\left(2025+1\right).1013÷2=1026169$

Đáp số: $1026169$

$mong\; bạn\; tick\; cho\; mik$

[2025+1]:2 +1

tự tính nhé

6/7+(5/8-3/16):5.-4

=6/7+(10/16-3/16):5.-4

=6/7+7/16:5.-4

=6/7+7/80.-4

=6/7+-28/80

=6/7+7/20

120/140+49/140

=169/140