=-3/31-6/17+1/25-28/31-11/17-1/5

=-1-1-4/25=-2-4/25=-54/25

b: D=(-3/31-28/31)+(-6/17-11/17)+(1/25-5/25)

=-2-4/25=-54/25

=\(-\dfrac{54}{25}\)

\(=\left[\left(-\dfrac{3}{31}\right)+\left(-\dfrac{28}{31}\right)\right]+\left[\left(-\dfrac{6}{17}\right)+\left(-\dfrac{11}{17}\right)\right]+\left[\dfrac{1}{25}+\left(-\dfrac{1}{5}\right)\right]\)

\(=\left(-1\right)+\left(-1\right)+\left[\dfrac{1}{25}+\left(-\dfrac{5}{25}\right)\right]\)

\(=\left(-1\right)+\left(-1\right)+\left(-\dfrac{4}{25}\right)\)

\(=\left(-2\right)+\left(-\dfrac{4}{25}\right)\)

\(=\left(-\dfrac{50}{25}\right)+\left(-\dfrac{4}{25}\right)\)

\(=-\dfrac{54}{25}\)

\(=\left(\dfrac{-3}{31}+\dfrac{-28}{31}\right)+\left(\dfrac{-6}{17}+\dfrac{-11}{17}\right)+\left(\dfrac{1}{25}+\dfrac{1}{5}\right)\)

\(=-1+-1+\left(\dfrac{1}{25}+\dfrac{-5}{25}\right)\)

\(=-2\)\(+\dfrac{-4}{25}\)

\(=\)\(\dfrac{50}{25}+\dfrac{-4}{25}\)

=\(\dfrac{46}{25}\)

Giúp tớ với tớ cần gấp

a: \(=\dfrac{-5}{7}-\dfrac{2}{7}+\dfrac{3}{4}+\dfrac{1}{4}-\dfrac{1}{5}=-\dfrac{1}{5}\)

b: \(=\dfrac{-3}{31}-\dfrac{28}{31}+\dfrac{-6}{17}-\dfrac{11}{17}+\dfrac{1}{29}-\dfrac{1}{5}=\dfrac{-24}{145}\)

bạn lên mạng tra từng câu 1 sẽ có

ukm cảm ơn bạn nhìu

Mik cần nhanh, mai mik hok r T^T

1) Tính nhanh 

\(A=\frac{4}{7}+\frac{3}{4}+\frac{2}{7}+\frac{5}{4}+\frac{1}{7}\)

\(=\left(\frac{4}{7}+\frac{2}{7}+\frac{1}{7}\right)+\left(\frac{3}{4}+\frac{5}{4}\right)\)

\(=1+2=3\)

Ghép tương tự vs B 

A = \(\frac{4}{7}+\frac{3}{4}+\frac{2}{7}+\frac{5}{4}+\frac{1}{7}\)

   = \(\left(\frac{2}{7}+\frac{4}{7}+\frac{1}{7}\right)+\left(\frac{3}{4}+\frac{5}{4}\right)\)

   =           \(1+2\)

   =            \(3\)

1,35326087

-2/3

0

-6/29/44

-9

nha bạn