a)\(\frac{54}{270}=\frac{54:54}{270:54}=\frac{1}{5}\)
b)\(\frac{23}{99}=\frac{23.101}{99.101}=\frac{2323}{9999}\)
c)\(\frac{1414}{-2121}=\frac{1414:\left(-707\right)}{-2121:\left(-707\right)}=\frac{-2}{3}\)
d)\(\frac{-131313}{-171717}=\frac{-131313:\left(-10101\right)}{-171717:\left(-10101\right)}=\frac{13}{17}\)
mik hơi vội nên có j sai sót bn thông cảm nha
tick mik vs