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\(A=\frac{2^{13}.9-2^{12}.5}{2^{12}.6+2^{12}.7}\)
\(=\frac{2^{12}.\left(2.9-5\right)}{2^{12}.\left(6+7\right)}\)
\(=\frac{2^{12}.\left(18-5\right)}{2^{12}.13}\)
\(=\frac{2^{12}.13}{2^{12}.13}=1\)
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
Bài 1:
\(\dfrac{-5}{18}=\dfrac{-20}{72};\dfrac{7}{-24}=\dfrac{-21}{72}.\)
\(\dfrac{-15}{-40}=\dfrac{3}{8}=\dfrac{9}{24};\dfrac{24}{-72}=\dfrac{-1}{3}=\dfrac{-8}{24}.\)
Bài 3:
a) \(\dfrac{2}{3}h=\dfrac{8}{12}h;\dfrac{3}{4}h=\dfrac{9}{12}h.\Rightarrow\dfrac{2}{3}h< \dfrac{3}{4}h.\)
b) \(\dfrac{4}{5}km/h=\dfrac{8}{10}km/h;\dfrac{9}{10}km/h.\Rightarrow\dfrac{4}{5}km/h< \dfrac{9}{10}km/h.\)
\(a,\dfrac{-8}{-3};0;\dfrac{-2}{9};\dfrac{-7}{5};\dfrac{-13}{2}\\ b,\dfrac{-13}{-6};\dfrac{-18}{-24};\dfrac{17}{30}\dfrac{-2}{5};\dfrac{-11}{20};\dfrac{-7}{12}\)
a) − 3 4
b) − 3 4