题目内容

计算:
(1)22+(-4)+(-2)+4;               
(2)(-8)+(+0.25)-(-9)+(-
1
4
)

(3)(1
3
4
-
7
8
-
7
12
)×(-1
1
7
);             
(4)(-
7
30
)÷(
3
5
-
1
6
-
2
3
);
(5)(1
1
3
+
1
8
-2.75)×(-24)-|-2|3
;      
(6)19×
2
5
-0.4×(-18)+
2
5
×(-19)
(1)原式=22-2=20;
(2)原式=-8+
1
4
+9-
1
4
=1;
(3)原式=(
7
4
-
7
8
-
7
12
)×(-
8
7
)=
7
4
×(-
8
7
)-
7
8
×(-
8
7
)-
7
12
×(-
8
7
)=-2+1+
2
3
=-
1
3

(4)原式=-
7
30
÷(
18
30
-
5
30
-
20
30
)=-
7
30
÷(-
7
30
)=1;
(5)原式=(
4
3
+
1
8
-
11
4
)×(-24)-8=
4
3
×(-24)+
1
8
×(-24)-
11
4
×(-24)-8=-32-3+66-8=23;
(6)原式=(19+18-19)×
2
5
=18×
2
5
=
36
5
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