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a; \(\dfrac{9}{4}\) - \(\dfrac{-11}{4}\)
= \(\dfrac{9}{4}\) + \(\dfrac{11}{4}\)
= \(\dfrac{20}{4}\)
= 5
b; \(\dfrac{7}{8}\) - \(\dfrac{3}{-8}\) - \(\dfrac{1}{8}\)
= \(\dfrac{7}{8}\) + \(\dfrac{3}{8}\) - \(\dfrac{1}{8}\)
= \(\dfrac{7+3-1}{8}\)
= \(\dfrac{9}{8}\)
c; \(\dfrac{-5}{21}\) - \(\dfrac{25}{21}\) - \(\dfrac{-1}{21}\)
= \(\dfrac{-5}{21}\) - \(\dfrac{25}{21}\) + \(\dfrac{1}{21}\)
= \(\dfrac{-5-25+1}{21}\)
= \(\dfrac{-29}{21}\)
1,
a,-3/5
b,-1/2
c,19/39
d,1/4
e,-39/40
f,-59/56
2,
a,=
b,<
c,>
d,<
k cho mình nha
a: \(=\dfrac{15}{40}-\dfrac{8}{40}+\dfrac{3}{40}=\dfrac{10}{40}=\dfrac{1}{4}\)
b: \(=\dfrac{68}{72}-\dfrac{132}{72}+\dfrac{16}{72}=\dfrac{-48}{72}=\dfrac{-2}{3}\)
c: \(=\dfrac{48}{90}-\dfrac{35}{90}-\dfrac{13}{90}=0\)
e: \(=\dfrac{3}{4}-\dfrac{17}{60}+\dfrac{3}{5}=\dfrac{45-17+36}{60}=\dfrac{64}{60}=\dfrac{16}{15}\)
ko có?;-;
d