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\(\dfrac{15}{35}=\dfrac{15:5}{35:5}=\dfrac{3}{7}\)
\(\dfrac{24}{27}=\dfrac{24:3}{27:3}=\dfrac{8}{9}\)
\(\dfrac{17}{50}\) ( phân số dã tối giản )
\(\dfrac{15}{45}=\dfrac{15:3}{45:3}=\dfrac{5}{15}=\dfrac{5:5}{15:5}=\dfrac{1}{3}\)
\(\dfrac{99}{121}=\dfrac{99:11}{121:11}=\dfrac{9}{11}\)
`24/27` chưa được rút gọn nha:'>
\(\dfrac{24}{27}=\dfrac{24:3}{27:3}=\dfrac{8}{9}\)
5/10=1/2
3/15=1/5
40/70=4/7
24/36=2/3
70/42=5/3
CHÚC BÀ HỌC GIỎI
a. 18/72 = 1/4
15/20 = 3/4
vì 1/4<3/4 nên 18/72<15/20
b. 24/36 = 2/3
20/50 = 2/5
2/3>2/5 nên 24/36>20/50
a, \(\dfrac{18}{72}\) = \(\dfrac{18:18}{72:18}\) = \(\dfrac{1}{4}\); \(\dfrac{15}{20}\) = \(\dfrac{3}{4}\)
Vì \(\dfrac{1}{4}\) < \(\dfrac{3}{4}\) nên \(\dfrac{18}{72}\) < \(\dfrac{15}{20}\)
b, \(\dfrac{24}{36}\) = \(\dfrac{24:12}{36:12}\) = \(\dfrac{2}{3}\); \(\dfrac{20}{50}\) = \(\dfrac{20:10}{50:10}\) = \(\dfrac{2}{5}\)
Vì \(\dfrac{2}{3}\) > \(\dfrac{2}{5}\) nên \(\dfrac{24}{36}\) > \(\dfrac{20}{50}\)
\(a,\frac{45}{60}=\frac{45:15}{60:15}=\frac{3}{4}\)
\(b,\frac{39}{12}=\frac{39:3}{12:3}=\frac{13}{4}\)
\(c,\frac{81}{90}=\frac{81:9}{90:9}=\frac{9}{10}\)
\(d,\frac{360}{720}=\frac{360:360}{720:360}=\frac{1}{2}\)
\(e,\frac{24}{20}=\frac{24:4}{20:4}=\frac{6}{5}\)
\(g,\frac{66}{65}=\frac{66}{65}\)
\(...,\frac{66}{55}=\frac{66:11}{55:11}=\frac{6}{5}\)
a) 45/60 = 3/4
b) 39/12 = 13/4
c) 81/90 = 9/10
d) 360/720 = 1/2
e) 24/20 = 6/5
g) 66/65 = 66/65
h) 66/55 = 6/5
mik nha !~
\(\dfrac{3}{9}=\dfrac{3:3}{9:3}=\dfrac{1}{3}\)
\(\dfrac{15}{27}=\dfrac{15:3}{27:3}=\dfrac{5}{9}\)
\(\dfrac{28}{20}=\dfrac{28:4}{20:4}=\dfrac{7}{5}\)
\(\dfrac{5}{105}=\dfrac{5:5}{105:5}=\dfrac{1}{21}\)
\(\dfrac{24}{39}=\dfrac{24:3}{39:3}=\dfrac{8}{13}\)
3/9=.....1/3
15/27=.....5/9
28/20=....7/5
5/105=.....1/21
24/39=.....8/13