\(\frac{-1275}{100}-2,75:\left(\frac{-11}{4}.x+11\right)=\frac{-27}{2}\)

\(2,75:\left(\frac{-11}{4}.x+11\right)=\frac{-1275}{100}-\frac{-27}{2}\)

\(2,75:\left(\frac{-11}{4}.x+11\right)=\frac{-51}{4}-\frac{-54}{4}\)

\(2,75:\left(\frac{-11}{4}.x+11\right)=\frac{3}{4}\)

\(\frac{-11}{4}.x+11=2,75:\frac{3}{4}\)

\(\frac{-11}{4}.x+11=\frac{11}{4}:\frac{3}{4}\)

\(\frac{-11}{4}.x+11=\frac{11}{4}.\frac{4}{3}\)

\(\frac{-11}{4}.x+11=\frac{11}{3}\)

\(\frac{-11}{4}.x=\frac{11}{3}-11\)

\(\frac{-11}{4}.x=\frac{11}{3}-\frac{33}{3}\)

\(\frac{-11}{4}.x=\frac{-22}{3}\)

\(x=\frac{-22}{3}:\frac{-11}{4}\)

\(x=\frac{-22}{3}.\frac{4}{-11}\)

\(x=\frac{8}{3}\)

Vậy \(x=\frac{8}{3}\)

    ( 3,5 x 10,25 + 10,25 x 6,5 ) +  (65 x 11 - 65 : 0,1 )

=  10,25 x ( 3,5 + 6,5 )              +  65 x ( 11 - 0,1 )

=   10,25 x       10                     +  65 x       10,9

=         102,5                             +         708,5

=              811

bn tự bấm máy tính nhá

= ( 1,25+ 14, 75) + (2,75+16,25) + (4,25+11,75) + ( 5, 75 +10,25) + 8,75

= 15 + 19 + 16 + 16 + 8,75

=74 ,75

k mk nhé [ko chắc chắn, có thể sai hoàn toàn đó...cẩn thận nhoa >.<

1,25 - 2,75 + 4,25 - 5,75 + 7,5 - 8, 75 + 10,25 - 11,75 + 13,25 - 14,75 + 16,25

= 9

mình ko biết làm

lưu lê thanh bình

Rảnh quá à bạn

Không biết thì thôi làm gì mà phải viết vào câu trả lời thế ????

Thôi, học đi nha !

kệ mk bạn lớp mấy vậy 

Mik làm Bài 2 nhé ~

Bài 2 :

a) \(x-\dfrac{1}{2}=-\dfrac{1}{10}\)

\(x=-\dfrac{1}{10}+\dfrac{1}{2}\)

\(x=\dfrac{2}{5}\)

b) \(\dfrac{2}{3}x-\dfrac{7}{6}=\dfrac{5}{2}\)

\(\dfrac{2}{3}x=\dfrac{5}{2}+\dfrac{7}{6}\)

\(\dfrac{2}{3}x=\dfrac{11}{3}\)

\(x=\dfrac{11}{3}:\dfrac{2}{3}\)

\(x=\dfrac{11}{3}.\dfrac{3}{2}\)

\(x=\dfrac{11}{2}\)

c) \(2,5-\left(\dfrac{1}{8}x+\dfrac{1}{2}\right)=\dfrac{3}{4}\)

\(\left(\dfrac{1}{8}x+\dfrac{1}{2}\right)=2,5-\dfrac{3}{4}\)

\(\left(\dfrac{1}{8}x+\dfrac{1}{2}\right)=\dfrac{5}{2}-\dfrac{3}{4}\)

\(\dfrac{1}{8}x+\dfrac{1}{2}=\dfrac{7}{4}\)

\(\dfrac{1}{8}x=\dfrac{7}{4}-\dfrac{1}{2}\)

\(\dfrac{1}{8}x=\dfrac{5}{4}\)

\(x=10\)

Bài 1:

a) \(\dfrac{-4}{11}.\dfrac{7}{9}+\dfrac{-4}{11}.\dfrac{2}{9}-\dfrac{7}{11}\) 

\(=\dfrac{-4}{11}.\left(\dfrac{7}{9}+\dfrac{2}{9}\right)-\dfrac{7}{11}\) 

\(=\dfrac{-4}{11}.1-\dfrac{7}{11}\) 

\(=\dfrac{-4}{11}-\dfrac{7}{11}\) 

\(=-1\) 

b) \(\dfrac{3}{5}:\dfrac{-7}{10}+0,5-\left(\dfrac{-9}{14}\right)\) 

\(=\dfrac{-6}{7}+\dfrac{1}{2}+\dfrac{9}{14}\) 

\(=\dfrac{2}{7}\) 

c) \(\dfrac{3}{5}-\dfrac{8}{5}:\left(5,25+75\%\right)\) 

\(=\dfrac{3}{5}-\dfrac{8}{5}:\left(\dfrac{21}{4}+\dfrac{3}{4}\right)\) 

\(=\dfrac{3}{5}-\dfrac{8}{5}:6\) 

\(=\dfrac{3}{5}-\dfrac{4}{15}\) 

\(=\dfrac{1}{3}\)

Bài 2:

a) \(x-\dfrac{1}{2}=\dfrac{-1}{10}\) 

            \(x=\dfrac{-1}{10}+\dfrac{1}{2}\) 

            \(x=\dfrac{2}{5}\) 

b) \(\dfrac{2}{3}x-\dfrac{7}{6}=\dfrac{5}{2}\) 

            \(\dfrac{2}{3}x=\dfrac{5}{2}+\dfrac{7}{6}\) 

            \(\dfrac{2}{3}x=\dfrac{11}{3}\) 

               \(x=\dfrac{11}{3}:\dfrac{2}{3}\) 

               \(x=\dfrac{11}{2}\) 

c) \(2,5-\left(\dfrac{1}{8}x+\dfrac{1}{2}\right)=\dfrac{3}{4}\) 

                   \(\dfrac{1}{8}x+\dfrac{1}{2}=\dfrac{5}{2}-\dfrac{3}{4}\) 

                   \(\dfrac{1}{8}x+\dfrac{1}{2}=\dfrac{7}{4}\) 

                          \(\dfrac{1}{8}x=\dfrac{7}{4}-\dfrac{1}{2}\) 

                          \(\dfrac{1}{8}x=\dfrac{5}{4}\) 

                             \(x=\dfrac{5}{4}:\dfrac{1}{8}\) 

                             \(x=10\)

Bài 2: 

a: 

1: \(\dfrac{a}{b}=\dfrac{c}{d}\)

\(\Leftrightarrow\dfrac{a+b}{a}=\dfrac{c+d}{c}\)

hay \(\dfrac{a}{a+b}=\dfrac{c}{c+d}\)

:)))))))

1)   29,37- (5,25+4,12)=29,37-9,37=20

2)   26(13+173-86)=26. 100=2600

3)   9.37,5+37,,5=37,5(9+1)=37,5.10=375