Tính: b) [ ( − 7/8 ) : 21/16 ] − 5/3 . ( 1/3 − 7/10 )
Giải thích
b) [(−78):2116]−53.(13−710)
=[(−78).1621]−53.(1030−2130)
=(−7) . 168 . 21−53.(−1130)
=−7 . 8 . 28 . 7 . 3+5 . 113 . 5 . 6
=−23+1118=−118
b) [(−78):2116]−53.(13−710)
=[(−78).1621]−53.(1030−2130)
=(−7) . 168 . 21−53.(−1130)
=−7 . 8 . 28 . 7 . 3+5 . 113 . 5 . 6
=−23+1118=−118