Tính: d) 7/8 : ( 2/9 − 1/18 ) + 7/8 : ( 1/ 36 − 5/12 ) .
Giải thích
d) 78:(29−118)+78:(136−512)
=78:(418−118)+78:(136−1536)
=78:16+78:(−718)
=78 . 6+78 . (−187)
=78 . [6+(−187)]
=78 . [427+(−187)]
=78 . 247=3
d) 78:(29−118)+78:(136−512)
=78:(418−118)+78:(136−1536)
=78:16+78:(−718)
=78 . 6+78 . (−187)
=78 . [6+(−187)]
=78 . [427+(−187)]
=78 . 247=3