问题
解答题
计算 (1)22-(-4)+(-2)+4; (2)(-0.6)+1.7+(+0.6 )+(-1.7 )+(-9 ); (3)(-5)×
(4)(-12.5)×(-2.5)×(-4)×(-8). (5)[1
(6)-81÷
|
答案
(1)原式=22+4-2+4
=28;
(2)原式=[(-0.6)+(0.6)]+[1.7+(-1.7)]+(-9)
=-9;
(3)原式=0;
(4)原式[(-12.5)×(-8)]×[(-2.5)×(-4)]
=100×10
=1000;
(5)原式=(
-9-4+18)×(-25 24
)1 5
=-
-15 24
=-1
;5 24
(6)原式=-81×3-
×(-9)1 3
=-81×3+3
=3×(-80)
=-240.