(1)0-(-3.85)=3.85;
(2)-1-[1-(1-0.5×
)]×61 3
=-1-[1-1+
]×61 6
=-1-1=-2;
(3 )(?81)÷
×9 4
÷(?16)4 9
=81×
×4 9
×4 9
1 16
=1;
(4)49
×(?16)15 16
=-(50-
)×161 16
=-(800-1)
=-799;
(5)(
-1 2
+5 9
)×(-36)7 12
=-(18-20+21)
=-19;
(6)?7×(?
)+26×(?22 7
)?2×22 7
22 7
=(7-26-2)×
22 7
=-21×
22 7
=-66.