\(A=8\dfrac{2}{7}-\left(3\dfrac{4}{9}+4\dfrac{2}{7}\right)\)
\(A=\dfrac{58}{7}-\left(\dfrac{31}{9}+\dfrac{30}{7}\right)\)
\(A=\dfrac{58}{7}-\dfrac{30}{7}-\dfrac{31}{9}\)
\(A=\dfrac{28}{7}-\dfrac{31}{9}\)
\(A=4-\dfrac{31}{9}\)
\(A=\dfrac{4}{1}-\dfrac{31}{9}\)
\(A=\dfrac{36}{9}-\dfrac{31}{9}\)
\(\Rightarrow A=\dfrac{5}{9}\)
\(B=\left(10\dfrac{2}{9}+2\dfrac{3}{5}\right)-6\dfrac{2}{9}\)
\(B=\left(\dfrac{92}{9}+\dfrac{13}{5}\right)-\dfrac{56}{9}\)
\(B=\dfrac{92}{9}-\dfrac{56}{9}+\dfrac{13}{5}\)
\(B=\dfrac{36}{9}+\dfrac{13}{5}\)
\(B=4+\dfrac{13}{5}\)
\(B=\dfrac{20}{5}+\dfrac{13}{5}\)
\(\Rightarrow B=\dfrac{33}{5}\)
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 = \(\dfrac{33}{5}\).
A= \(8\dfrac{2}{7}-\left(3\dfrac{4}{9}+4\dfrac{2}{7}\right)=8\dfrac{2}{7}-3\dfrac{4}{9}-4\dfrac{2}{7}=8\dfrac{2}{7}-4\dfrac{2}{7}-3\dfrac{4}{9}=4-3\dfrac{4}{9}=3\dfrac{9}{9}-3\dfrac{4}{9}=\dfrac{5}{9}\)
\(B=\left(10\dfrac{2}{9}+2\dfrac{3}{5}\right)-6\dfrac{2}{9}=10\dfrac{2}{9}+2\dfrac{3}{5}-6\dfrac{2}{9}=10\dfrac{2}{9}-6\dfrac{2}{9}+2\dfrac{3}{5}=4+2\dfrac{3}{5}=6\dfrac{3}{5}\)
Đề yêu cầu gì bạn? Tính hay so sánh hay gì?
