问题 解答题
计算:
(1)(+
3
4
)+(-2
3
4
)+(+0.125)+(-12
5
7
)+(-4
1
8
)

(2)-3.5÷
7
8
×(
8
7
)

(3)-5×(-
1
5
)+13×(-
11
5
)
-3÷(-
5
11
)  
(4)-24×(-
1
2
+
3
4
-
1
3
)

(5)(-1)2008+(-5)×[(-2)3+2]-(-4)2÷(-
1
2
)
     
(6)-19
8
9
×3(用简便计算)
答案

(1)原式=

3
4
-2
3
4
+
1
8
-12
5
7
-4
1
8
=-2+
1
8
-4
1
8
-12
5
7
=-2-4-12
5
7
=-18
5
7

(2)原式=-

7
2
×
8
7
×
8
7
=-
32
7

(3)原式=1-13×

11
5
-3×
11
5
=1-
143
5
-
33
5
=1-
176
5
=-
171
5

(4)原式=24×

1
2
-24×
3
4
+24×
1
3
=12-18+8=2;

(5)原式=1-5(-8+2)+16×2=1-5×(-6)+32=1+30+32=63;

(5)原式=(

1
9
-20)×3=
1
9
×3-60=
1
3
-60=-59
2
3

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