答案
解:(1)原式=-20-18-12+10=-40;
(2)原式=-
-
-3=-4;
(3)原式=-
×48=-24;
(4)原式=-2.5×17×4×0.1=-
×17×4×
=-17;
(5)原式=33.1-10.7+22.9-2.3=43;
(6)原式=-36÷4+5×1.2=-9+6=-3;
(7)原式=-
×(-9×
+0.8)÷
=
×
×
=
;
(8)原式=-4-6+2+3×
=-4-6+2+1=-7.
解:(1)原式=-20-18-12+10=-40;
(2)原式=-
-
-3=-4;
(3)原式=-
×48=-24;
(4)原式=-2.5×17×4×0.1=-
×17×4×
=-17;
(5)原式=33.1-10.7+22.9-2.3=43;
(6)原式=-36÷4+5×1.2=-9+6=-3;
(7)原式=-
×(-9×
+0.8)÷
=
×
×
=
;
(8)原式=-4-6+2+3×
=-4-6+2+1=-7.