(1)6;(2)-19;(3)-5;(4)-2;
(5)24;(6)90 (7) 0 (8)
(1)-54×2
÷(-4
)×
=54×
×
×
=6;
(2)(
-
+
)×(-36)
=-18+20-21
=-19;
(3)-4×7-(-3)×6+5
=-28+18+5
=-5;
(4)-1-[1-(1-0.5×
)]×6
=-1-[1-(1-
×
)]×6
=-1-6+6-
×
×6
=-1-6+6-1
=-2;
(5)-2 2-(-3) 3×(-1) 4-(-1) 5
=-4+27×1+1
=-4+27+1
=24;
(6)(-
)×(-4) 2-0.25×(-5)×(-4) 3
=-
×16-0.25×5×64
=-10-80
=-90;
(7)(-1)+(-1) 2+(-1) 3+…+(-1) 99+(-1) 100
=-1+1-1+…-1+1
=0;
(8)
+
+
=
)+
×(
-
)+
×(
-
)+…+
×(
-
)
=
×(
-
)
=
.