问题 解答题
计算:
(1)(-
1
2
)+(-
2
3
)+(-
5
6
);      
(2)(-
1
2
)+3
1
4
+2.75+(-6
1
2

(3)(-1)+(+2)+(-3)+(+4)+…(-2001)+(+2002)+(-2003)+(+2004)
(4)-14-(1-0.5)×
1
3
×〔2-(-3)2
(5)25×
3
4
-(-25)×
1
2
+25×
1
4

(6)-|-32|÷3×(-
1
3
)-(-2)3
答案

(1)原式=-(

1
2
+
2
3
+
5
6
)=-2;

(2)原式=(-

1
2
-6
1
2
)+(3.25+2.75)=-7+6=-1;

(3)原式=(-1+2)+(-3+4)+…+(-2003+2004)=1+1+…+1=1002;

(4)原式=-1-

1
2
×
1
3
×(-7)=-1+
7
6
=
1
6

(5)原式=25×(

3
4
+
1
2
+
1
4
)=25×
3
2
=
75
2

(6)原式=-9×

1
3
×(-
1
3
)+8=1+8=9.

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