题目内容
解答下列各题:
(1)(-12)-5+(-14)-(-39)
(2)3
-(-
)+2
+(-
)
(3)
-|-1
|-(+2
)-(-2.75)
(4)(-1)+2+(-3)+4+…+(-99)+100.
(1)(-12)-5+(-14)-(-39)
(2)3
1 |
2 |
1 |
3 |
2 |
3 |
1 |
2 |
(3)
2 |
5 |
1 |
2 |
1 |
4 |
(4)(-1)+2+(-3)+4+…+(-99)+100.
(1)原式=-12-5-14+39=-31+39=8;
(2)原式=(3
-
)+(
+2
)=3+3=6;
(3)原式=
-1
-2
+2.75=
-1
+
=
-1=-
;
(4)原式=(-1+2)+(-3+4)+…+(-99+100)=50.
(2)原式=(3
1 |
2 |
1 |
2 |
1 |
3 |
2 |
3 |
(3)原式=
2 |
5 |
1 |
2 |
1 |
4 |
2 |
5 |
1 |
2 |
1 |
2 |
2 |
5 |
3 |
5 |
(4)原式=(-1+2)+(-3+4)+…+(-99+100)=50.
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