计算:(1)0-1+2-3+4-5;(2)-4.2+5.7-8.4+10.2;(3)-30-11-(-10)+(-12)+18;(4)(+12)-(-45)+(-23)-(+12)+(-13);(5)

题目简介

计算:(1)0-1+2-3+4-5;(2)-4.2+5.7-8.4+10.2;(3)-30-11-(-10)+(-12)+18;(4)(+12)-(-45)+(-23)-(+12)+(-13);(5)

题目详情

计算:
(1)0-1+2-3+4-5;
(2)-4.2+5.7-8.4+10.2;
(3)-30-11-(-10)+(-12)+18;
(4)(+
1
2
)-(-
4
5
)+(-
2
3
)-(+
1
2
)+(-
1
3
);
(5)|-7
3
8
+4
1
2
|+(-18
1
4
)+|-6-
1
2
|;
(6)3
1
2
-(-2
1
4
)+(-
1
3
)-0.25+(+
1
6
).
题型:解答题难度:中档来源:不详

答案

(1)原式=(2+4)+(-1-3-5)=6-9=-3;
(2)原式=(5.7+10.2)+(-4.2-8.4)=15.9-12.6=3.3;
(3)原式=-30-11+10-12+18=(-30-11-12)+(10+18)=-53+28=-25;
(4)原式=class="stub"1
2
+class="stub"4
5
-class="stub"2
3
-class="stub"1
2
-class="stub"1
3
=class="stub"4
5
-1=-class="stub"1
5

(5)原式=3class="stub"1
8
-18class="stub"1
4
+6class="stub"1
2
=9class="stub"5
8
-18class="stub"2
8
=-9class="stub"3
8

(6)原式=3class="stub"1
2
+2class="stub"1
4
-class="stub"1
3
-class="stub"1
4
+class="stub"1
6
=3class="stub"1
3
-2=1class="stub"1
3

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