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a: =32+1,6=33,6
b: =-0,5x1,23=-0,615
c: =-2,3-7,7=-10
d: =0,325-3,21=-2,885
\(\dfrac{2}{5}-9-\dfrac{7}{2}\)
\(=\dfrac{2}{5}-\dfrac{9}{1}-\dfrac{7}{2}\)
\(=\left(\dfrac{2}{5}-\dfrac{9}{1}\right)-\dfrac{7}{2}\)
\(=\left(\dfrac{2}{5}-\dfrac{45}{5}\right)-\dfrac{7}{2}\)
\(=-\dfrac{43}{5}-\dfrac{7}{2}\)
\(=-\dfrac{86}{10}-\dfrac{35}{10}\)
\(=-\dfrac{121}{10}\)
\(=2\cdot\left(\dfrac{1}{3}-\dfrac{1}{5}+\dfrac{1}{5}-\dfrac{1}{7}+\dfrac{1}{7}-\dfrac{1}{9}+...+\dfrac{1}{97}-\dfrac{1}{99}+\dfrac{1}{99}-\dfrac{1}{101}\right)\)
\(=2\cdot\left(\dfrac{1}{3}-\dfrac{1}{101}\right)=2\cdot\dfrac{98}{303}=\dfrac{196}{303}\)
a: 2/5<>-4/10
b: \(\dfrac{4}{-3}=-\dfrac{8}{6}\left(=-\dfrac{4}{3}\right)\)
c: \(-\dfrac{1}{5}< >-\dfrac{1}{-5}\)
d: \(\dfrac{5}{11}=\dfrac{-5}{-11}\left(=\dfrac{5}{11}\right)\)
tk
a: =31,1-2,259=28,841
b: =-11-0,325=-11,325