So sánh
\(\frac{12}{13}\)và \(\frac{-12}{-13}\)
So sánh các phân số sau bằng cách hợp lí:
a)\(\frac{13}{57}\)so sánh với \(\frac{29}{73}\)
b)\(\frac{17}{42}\)so sánh với\(\frac{13}{38}\)
c)\(\frac{7}{41}\)so sánh với \(\frac{13}{47}\)
So sánh: \(\frac{2018^{13}+1}{2018^{14}+1}\)và \(\frac{2018^{12}+1}{2018^{13}+1}\)
Rut gon: \(A=\frac{9+\frac{9}{11}+\frac{18}{23}-\frac{27}{27}}{8+\frac{8}{11}+\frac{16}{23}-\frac{24}{37}}-\frac{2+\frac{16}{29}-\frac{24}{13}-\frac{32}{11}}{3+\frac{24}{29}-\frac{36}{13}-\frac{48}{11}}\)
so sánh\(A=\frac{31}{13}-\left(\frac{7}{32}+\frac{8}{2}\right)vaB=\left(\frac{1}{3}+\frac{12}{67}+\frac{13}{41}\right)-\left(\frac{79}{67}-\frac{28}{41}\right)\)
So sánh nhanh:
a)\(\frac{13}{18}và\frac{21}{29}\)
b) \(\frac{-5}{12}và\frac{-22}{31}\)
Tính nhanh:
\(\frac{-15}{29}+\frac{7}{-13}-1\frac{2}{13}:\frac{29}{31}+\frac{15}{29}.\frac{-5}{13}\)
so sánh \(\frac{13^{15}+1}{13^{16}+1};\frac{13^{16}+1}{13^{17}+1}\)
So sánh A và B
A=\(\frac{13^{15}+1}{13^{14}+1}\)
B=\(\frac{13^{14}+1}{13^{13}+1}\)