K
Khách

Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.

21 tháng 6 2022

\(-1,75-\left(-\dfrac{1}{9}-2\dfrac{1}{18}\right)\)

\(=-1,75-\left(-\dfrac{1}{9}-\dfrac{37}{18}\right)\)

\(=-1,75-\left(-\dfrac{39}{18}\right)\)

\(=\dfrac{5}{12}\)

14 tháng 9 2021

\(=-\dfrac{7}{4}+\dfrac{1}{9}+\dfrac{37}{18}\\ =\dfrac{-63+4+37}{36}=\dfrac{-23}{36}\)

14 tháng 9 2021

\(-1,75-\left(-\dfrac{1}{9}-2\dfrac{1}{18}\right)=-\dfrac{7}{4}+\dfrac{1}{9}+\dfrac{37}{18}=\dfrac{\left(-7\right).9+4+37.2}{36}=\dfrac{5}{12}\)

\(-1,75-\left(\dfrac{-1}{9}-2\dfrac{1}{18}\right)\)

\(=-1,75-\left(\dfrac{-2}{18}-\dfrac{37}{18}\right)\)

\(=\dfrac{-10,5}{6}-\dfrac{13}{6}\)

\(=\dfrac{-23,5}{6}\)

\(=-\dfrac{47}{12}\)

5 tháng 7 2018

\(\dfrac{5}{12}\) mới đúng

21 tháng 6 2022

Dấu "^" của cậu nghĩa là phân số?

\(a,-1,75-\left(-\dfrac{1}{9}-2\dfrac{1}{18}\right)=-\dfrac{7}{4}-\left(-\dfrac{2}{18}-\dfrac{37}{18}\right)=-\dfrac{7}{4}+\dfrac{13}{6}=\dfrac{5}{12}\)

\(b,-\dfrac{1}{12}-\left(2\dfrac{5}{8}-\dfrac{1}{3}\right)=-\dfrac{1}{12}-\dfrac{55}{24}=-\dfrac{19}{8}\)

\(c,-\dfrac{5}{6}-\left(-\dfrac{3}{8}+\dfrac{1}{30}\right)=-\dfrac{5}{6}+\dfrac{41}{120}=-\dfrac{59}{120}\)

 

1 tháng 8 2022

c) -55/36

d)-67/120 

16 tháng 5 2022

a.-1,75-(-\(\dfrac{1}{9}\)-2\(\dfrac{1}{8}\))
-1,75-\(\dfrac{1}{9}+\dfrac{17}{8}\)
\(-\dfrac{7}{4}-\dfrac{1}{9}+\dfrac{17}{8}\)
\(\dfrac{-126}{72}-\dfrac{8}{72}+\dfrac{153}{72}\)
=\(\dfrac{19}{72}\)

16 tháng 5 2022

b.\(\dfrac{-1}{12}-\left(2\dfrac{5}{8}-\dfrac{1}{3}\right)\)
\(\dfrac{-1}{12}-\left(\dfrac{21}{8}-\dfrac{1}{3}\right)\)
\(\dfrac{-1}{12}-\dfrac{21}{8}+\dfrac{1}{3}\)
\(\dfrac{-2}{24}-\dfrac{63}{24}+\dfrac{64}{24}\)
=\(\dfrac{-1}{24}\)

Bài 1:

a) Ta có: \(\frac{3}{8}+\frac{-5}{6}\)

\(=\frac{3}{8}-\frac{5}{6}\)

\(=\frac{9}{24}-\frac{20}{24}\)

\(=-\frac{11}{24}\)

b) Ta có: \(\frac{15}{12}-\frac{-1}{4}\)

\(=\frac{15}{12}+\frac{1}{4}\)

\(=\frac{15}{12}+\frac{3}{12}\)

\(=\frac{18}{12}=\frac{3}{2}\)

Bài 2:

a) Ta có: \(-\frac{1}{12}-\left(2\frac{5}{8}-\frac{1}{3}\right)\)

\(=-\frac{1}{12}-\frac{21}{8}+\frac{1}{3}\)

\(=\frac{-2}{24}-\frac{63}{24}+\frac{8}{24}\)

\(=\frac{-57}{24}\)

\(=-\frac{19}{8}\)

b) Ta có: \(\frac{-5}{6}-\left(\frac{-3}{8}+\frac{1}{10}\right)\)

\(=\frac{-5}{6}+\frac{3}{8}-\frac{1}{10}\)

\(=\frac{-100}{120}+\frac{45}{120}-\frac{12}{120}\)

\(=\frac{-67}{120}\)

c) Ta có: \(-1.75-\left(\frac{-1}{9}-2\frac{1}{18}\right)\)

\(=-\frac{7}{4}+\frac{1}{9}+\frac{37}{18}\)

\(=\frac{-63}{36}+\frac{4}{36}+\frac{74}{36}\)

\(=\frac{15}{36}=\frac{5}{12}\)