1,2. 15/4+16/7.-85/8-1,2.5 3/4-16/7. -71/8
Giải thích
c) 1,2 . 154+167 . −858−1,2 . 534−167 . −718
=65 . 154−65 . 234+167 . −858−167 . −718
=65 . 154−234+167 . −858−−718
=65 . −84+167 . −148
=65 . (−2)+167 . −74
=−125+(−4)
=−125+−205=−325.
c) 1,2 . 154+167 . −858−1,2 . 534−167 . −718
=65 . 154−65 . 234+167 . −858−167 . −718
=65 . 154−234+167 . −858−−718
=65 . −84+167 . −148
=65 . (−2)+167 . −74
=−125+(−4)
=−125+−205=−325.