rut gon cac phan so duoi day
12 ,45 ,30 ,25 ,12
16 ,54 ,65 ,75 ,1000
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15/24 = 5/8 ; 21/24 = 7/8 ; 54/18 = 9/3 ; 100/25 = 4/1.
a)\(\frac{16}{20}=\frac{4}{5};\frac{9}{15}=\frac{3}{5}\)
Vì 4>3\(\Rightarrow\frac{4}{5}>\frac{3}{5}\) hay \(\frac{16}{20}>\frac{9}{15}\)
Vậy \(\frac{16}{20}>\frac{9}{15}\)
b) \(\frac{6}{8}=\frac{3}{4};\frac{3}{12}=\frac{1}{4}\)
Vì 3>1 \(\Rightarrow\frac{3}{4}>\frac{1}{4}\) hay \(\frac{6}{8}=\frac{3}{12}\)
Vậy \(\frac{6}{8}=\frac{3}{12}\)
c) \(\frac{15}{25}=\frac{3}{5};\frac{36}{45}=\frac{4}{5}\)
Vì 3<4 \(\Rightarrow\frac{3}{5}<\frac{4}{5}\) hay \(\frac{15}{25}<\frac{36}{45}\)
Vậy \(\frac{15}{25}<\frac{36}{45}\)
\(\frac{2^{23}\cdot45^{25}\cdot13^{22}\cdot35^{16}}{9^{26}\cdot65^{22}\cdot28^{17}\cdot25^9}=\frac{2^{23}\cdot5^{25}\cdot3^{50}\cdot13^{22}\cdot5^{16}\cdot7^{16}}{3^{52}\cdot5^{22}\cdot13^{22}\cdot7^{17}\cdot2^{54}\cdot5^{18}}=\frac{2^{23}\cdot3^{50}\cdot5^{31}\cdot7^{16}\cdot13^{22}}{2^{54}\cdot3^{52}\cdot5^{22}\cdot7^{17}\cdot13^{22}}=\frac{5^9}{2^{31}\cdot3^2\cdot7}\)
25/40 = 25:5/40:5 = 5/8
42/72 = 42:6/72:6 = 7/12
80/100 = 80:20/100:20 = 4/5
1. 5/8 ( chia cho 5)
2. 7/12 (chia cho 6)
3. 4/5 (chia cho 20)
duyệt đi
Ta có:\(\frac{39}{65}=\frac{39:13}{65:13}=\frac{3}{5}\)
Vậy phân số \(\frac{39}{65}\) rút gọn được \(\frac{3}{5}\)
\(\frac{65}{91}=\frac{65:13}{91:13}=\frac{5}{7}\)
\(\frac{1414}{1919}=\frac{1414:101}{1919:101}=\frac{14}{19}\)
\(\frac{12}{16}=\frac{3}{4}\)
\(\frac{45}{54}=\frac{5}{6}\)
\(\frac{30}{65}=\frac{6}{13}\)
\(\frac{25}{75}=\frac{1}{3}\)
\(\frac{12}{1000}=\frac{3}{250}\)