计算:(1)(-100)+(-200);(2)(-313)+(+212);(3)(-134)+(+1.75);(4)-5.1+0;(5)18.56+(-5.16)+(-1.44)+(+5.16)+(-

题目简介

计算:(1)(-100)+(-200);(2)(-313)+(+212);(3)(-134)+(+1.75);(4)-5.1+0;(5)18.56+(-5.16)+(-1.44)+(+5.16)+(-

题目详情

计算:
(1)(-100)+(-200);
(2)(-3
1
3
)+(+2
1
2
);
(3)(-1
3
4
)+(+1.75);
(4)-5.1+0;
(5)18.56+(-5.16)+(-1.44)+(+5.16)+(-18.56);
(6)4.1+(+
1
2
)+(-
1
4
)+(-10.1)+7.
题型:解答题难度:中档来源:不详

答案

(1)(-100)+(-200)=-(100+200)=-300;
(2)(-3class="stub"1
3
)+(+2class="stub"1
2
)=(-3+2)+(-class="stub"1
3
+class="stub"1
2
)=-1+class="stub"1
6
=-class="stub"5
6

(3)(-1class="stub"3
4
)+(+1.75)=-1.75+1.75=0;
(4)-5.1+0=-5.1;
(5)18.56+(-5.16)+(-1.44)+(+5.16)+(-18.56)=(18.56-18.56)+(-5.16+5.16)+(-1.44)=-1.44;
(6)4.1+(+class="stub"1
2
)+(-class="stub"1
4
)+(-10.1)+7=(4.1-10.1)+(class="stub"1
2
-class="stub"1
4
)+7=-6+class="stub"1
4
+7=1class="stub"1
4

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