Question

[Địa Ngục Thiên Thần]

A= \(8\dfrac{2}{7}-\left(3\dfrac{4}{9}+4\dfrac{2}{7}\right)\)

B=\(\left(10\dfrac{2}{9}+2\dfrac{3}{5}\right)-6\dfrac{2}{9}\)

- Giúp con ngu lâu dốt bền môn toán này với :(

Answer 1

[Phương Trâm]

\(A=8\dfrac{2}{7}-\left(3\dfrac{4}{9}+4\dfrac{2}{7}\right)\)

\(A=\dfrac{58}{7}-\left(\dfrac{31}{9}+\dfrac{30}{7}\right)\)

\(A=\dfrac{58}{7}-\dfrac{30}{7}-\dfrac{31}{9}\)

\(A=\dfrac{28}{7}-\dfrac{31}{9}\)

\(A=4-\dfrac{31}{9}\)

\(A=\dfrac{4}{1}-\dfrac{31}{9}\)

\(A=\dfrac{36}{9}-\dfrac{31}{9}\)

\(\Rightarrow A=\dfrac{5}{9}\)

\(B=\left(10\dfrac{2}{9}+2\dfrac{3}{5}\right)-6\dfrac{2}{9}\)

\(B=\left(\dfrac{92}{9}+\dfrac{13}{5}\right)-\dfrac{56}{9}\)

\(B=\dfrac{92}{9}-\dfrac{56}{9}+\dfrac{13}{5}\)

\(B=\dfrac{36}{9}+\dfrac{13}{5}\)

\(B=4+\dfrac{13}{5}\)

\(B=\dfrac{20}{5}+\dfrac{13}{5}\)

\(\Rightarrow B=\dfrac{33}{5}\)

Answer 2

[Nguyễn Minh Hiếu]

A = \(8\dfrac{2}{7}-\left(3\dfrac{4}{9}+4\dfrac{2}{7}\right)\)

A = \(8\dfrac{2}{7}-3\dfrac{4}{9}-4\dfrac{2}{7}\)\

A = \(\left(8\dfrac{2}{7}-4\dfrac{2}{7}\right)-3\dfrac{4}{9}\)

A = \(\left(8-4\right)-3\dfrac{4}{9}\)

A = \(4-3\dfrac{4}{9}\)

A = \(\dfrac{36}{9}-\dfrac{31}{9}\)

A = \(\dfrac{5}{9}\).

B = \(\left(10\dfrac{2}{9}+2\dfrac{3}{5}\right)-6\dfrac{2}{9}\)

B = \(10\dfrac{2}{9}+2\dfrac{3}{5}-6\dfrac{2}{9}\)

B = \(\left(10\dfrac{2}{9}-6\dfrac{2}{9}\right)+2\dfrac{3}{5}\)

B = \(4+2\dfrac{3}{5}\)

B = \(\dfrac{20}{5}+\dfrac{13}{5}\)

B = \(\dfrac{33}{5}\).