Bài 1
\(\dfrac{15}{100}=\dfrac{3}{20};\dfrac{25}{200}=\dfrac{1}{8};\dfrac{88}{648}=\dfrac{11}{81};\dfrac{312}{108}=\dfrac{26}{9};\dfrac{8}{1000}=\dfrac{1}{125};\dfrac{27}{315}=\dfrac{3}{35}\)
Bài 2:
a: 7/12=21/36
19/36=19/36
b: 2/3=40/60
1/4=15/60
3/5=36/60
c: 11/20=55/100
17/50=34/100