298/719:(1/4+1/12-1/3)-2011/2012
=298/719:0/12-2011/2012
=0-2011/2012
=-2011/2012
 

mình làm sai

 thì nhắc nhở mình để mình chỉnh sửa nhé

298/719:(1/4+1/12-1/3)-2011/2012
=298/719:0/12-2011/2012
=0-2011/2012
=-2011/2012

\(\frac{298}{719}:\left(\frac{1}{4}+\frac{1}{12}-\frac{1}{3}\right)-\frac{2011}{2012}\)

\(=\frac{298}{719}:0-\frac{2011}{2012}\)

Vậy biểu thức trên không có kết quả vì không số nào có thể chia hết cho 0

\(\text{Tính giá trị của biểu thức :}\)

\(\frac{298}{719}\text{ : }\left(\frac{1}{4}+\frac{1}{12}-\frac{1}{3}\right)-\frac{2011}{2012}\)

\(=\frac{298}{719}\text{ : }\left(\frac{3}{12}+\frac{1}{12}-\frac{4}{12}\right)-\frac{2011}{2012}\)

\(=\frac{298}{719}\text{ : }\left(\frac{4}{12}-\frac{4}{12}\right)-\frac{2011}{2012}\)

\(=\frac{298}{719}\text{ : }0-\frac{2011}{2012}\)

\(=0-\frac{2011}{2012} \)

\(=-0,999502982\)

\(\text{✅}\)

\(\frac{298}{719}:\left(\frac{1}{4}+\frac{1}{12}-\frac{1}{3}\right)-\frac{2011}{2012}\)

\(=\frac{298}{719}:0-\frac{2011}{2012}\)

Giá trị phép tính không tồn tại

\(\frac{298}{719}\left(\frac{1}{4}+\frac{1}{12}-\frac{1}{3}\right)-\frac{2011}{2012}\)

\(=\frac{298}{719}\cdot0-\frac{2011}{2012}\)

\(=0-\frac{2011}{2012}=-\frac{2011}{2012}\)

\(=\dfrac{298}{719}.0-\dfrac{2011}{2012}\)

\(=0-\dfrac{2011}{2012}\)

\(=-\dfrac{2011}{2012}\)

\(\dfrac{298}{719}:\left(\dfrac{1}{4}+\dfrac{1}{12}-\dfrac{1}{3}\right)-\dfrac{2011}{2012}\)

\(=\dfrac{298}{719}.0-\dfrac{2011}{2012}\)

\(=0-\dfrac{2011}{2012}\)

\(=-\dfrac{2011}{2012}\)

1)\(\dfrac{-5}{2}:\dfrac{1}{4}\) = \(\dfrac{-5}{2}\) x \(\dfrac{4}{1}\) = \(\dfrac{-20}{2}\)

1) \(\dfrac{-5}{2}:\left(\dfrac{3}{4}-\dfrac{1}{2}\right)\) \(=\dfrac{-5}{2}:\dfrac{1}{4}=-10\)