题目内容

计算
(1)22-(-4)+(-2)+4;
(2)(-0.6)+1.7+(+0.6 )+(-1.7 )+(-9 );
(3)(-5)×
5
6
×(-
9
5
)×
1
4
×0;
(4)(-12.5)×(-2.5)×(-4)×(-8).
(5)[1
1
24
-(
3
8
+
1
6
-
3
4
)×24]÷(-5)

(6)-81÷
1
3
-
1
3
÷(-
1
9
)
(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=(
25
24
-9-4+18)×(-
1
5

=-
5
24
-1
=-1
5
24


(6)原式=-81×3-
1
3
×(-9)
=-81×3+3
=3×(-80)
=-240.
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