计算:(1)(-23)+(-12);(2)6-(+3)-(-7)+(-2);(3)-1613+2916;(4)-0.5-(-314)+2.75-712;(5)-(-7)+(-2);(6)(-414)-

题目简介

计算:(1)(-23)+(-12);(2)6-(+3)-(-7)+(-2);(3)-1613+2916;(4)-0.5-(-314)+2.75-712;(5)-(-7)+(-2);(6)(-414)-

题目详情

计算:
(1)(-23)+(-12);
(2)6-(+3)-(-7)+(-2);
(3)-16
1
3
+29
1
6

(4)-0.5-(-3
1
4
)+2.75-7
1
2

(5)-(-7)+(-2);
(6)(-4
1
4
)-(+5
1
3
)-(-4
1
4
);
(7)(+9)+(-7)+(+10)+(-3)+(-9);
(8)1-3+5-7+9-11+…+97-99+100.
题型:解答题难度:中档来源:不详

答案

(1)(-23)+(-12)=-35;

(2)6-(+3)-(-7)+(-2)=6-3+7-2=13-5=8;

(3)-16class="stub"1
3
+29class="stub"1
6
=12class="stub"5
6


(4)-0.5-(-3class="stub"1
4
)+2.75-7class="stub"1
2
=-0.5-7.5+3.25+2.75=-8+6=-2;

(5)-(-7)+(-2)=7-2=5;

(6)(-4class="stub"1
4
)-(+5class="stub"1
3
)-(-4class="stub"1
4
)=-4class="stub"1
4
+4class="stub"1
4
-5class="stub"1
3
=-5class="stub"1
3


(7)(+9)+(-7)+(+10)+(-3)+(-9)=9-7+10-3-9=0;

(8)1-3+5-7+9-11+…+97-99+100=(1-3)+(5-7)+(9-11)+…+(97-99)+100=-2-2-2-…-2+100=-2×25+100=50.

更多内容推荐