18/63=2/7
54/12=9/2
27/45=3/5
135/351=15/38
tk cho mình
\(\frac{18}{63}=\frac{18:9}{63:9}=\frac{2}{7}\)
\(\frac{54}{12}=\frac{54:6}{12:6}=\frac{9}{2}\)
\(\frac{27}{45}=\frac{27:9}{45:9}=\frac{3}{5}\)
\(\frac{135}{315}=\frac{135:45}{315:45}=\frac{3}{7}\)
18\63 = 2\7
54/12 = 9\2
27\45 = 3\5
135\315 = 3/7
18/63 = 2/7 54/12 = 9/2 27/45 = 3/5 135/315 = 3/7
Chúc bạn học tốt !