问题
解答题
计算: (1)(-
(2)(-
(3)(-1)+(+2)+(-3)+(+4)+…(-2001)+(+2002)+(-2003)+(+2004) (4)-14-(1-0.5)×
(5)25×
(6)-|-32|÷3×(-
|
答案
(1)原式=-(
+1 2
+2 3
)=-2;5 6
(2)原式=(-
-61 2
)+(3.25+2.75)=-7+6=-1;1 2
(3)原式=(-1+2)+(-3+4)+…+(-2003+2004)=1+1+…+1=1002;
(4)原式=-1-
×1 2
×(-7)=-1+1 3
=7 6
;1 6
(5)原式=25×(
+3 4
+1 2
)=25×1 4
=3 2
;75 2
(6)原式=-9×
×(-1 3
)+8=1+8=9.1 3