计算:(1)-2.4+3.5-4.6+3.5;(2)3.75-(+1.5)-(-414)-(+812);(3)(-412)-{325-[-0.13-(-0.33)]}.-数学

题目简介

计算:(1)-2.4+3.5-4.6+3.5;(2)3.75-(+1.5)-(-414)-(+812);(3)(-412)-{325-[-0.13-(-0.33)]}.-数学

题目详情

计算:
(1)-2.4+3.5-4.6+3.5;
(2)3.75-(+1.5)-(-4
1
4
)-(+8
1
2
);
(3)(-4
1
2
)-{3
2
5
-[-0.13-(-0.33)]}.
题型:解答题难度:中档来源:不详

答案

(1)-2.4+3.5-4.6+3.5
=(-2.4-4.6)+(3.5+3.5)
=-7+7
=0;
(2)3.75-(+1.5)-(-4class="stub"1
4
)-(+8class="stub"1
2

=3.75-1.5+4class="stub"1
4
-8class="stub"1
2

=(3.75+4class="stub"1
4
)+(-1.5-8class="stub"1
2

=8+(-10)
=-2;
(3)(-4class="stub"1
2
)-{3class="stub"2
5
-[-0.13-(-0.33)]}
=(-4class="stub"1
2
)-{3class="stub"2
5
+0.13-0.33}
=-7.7.

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