Fractions

Summary

  • a−1⋅a=1a−1⋅a=1
  • a−1a−1 and 1a1a different s ymbols for the same number
  • ab=a⋅1b=a⋅b−1
  • ab and a/b are different n otation for a divided by b
  • If a,b≠0 are integers then a/b is called a common fraction
  • b⋅ab=a
  • a1=a
  • aa=1
  • ab⋅cd=a⋅cb⋅d
  • ab=a⋅cb⋅c
  • ab+cb=a+cb
  • −ab=a−b=−ab
  • −a−b=ab
  • a/bc/d=ab⋅dc=adbc
  • ab+cd=ad+bcbd