计算:(1)12-(-18)+(-7)-15;(2)(-16+34-512)×(-12);(3)42÷[(-2)2-(-5)×(-2)];(4)-14-16×[2-(-3)2].-数学

题目简介

计算:(1)12-(-18)+(-7)-15;(2)(-16+34-512)×(-12);(3)42÷[(-2)2-(-5)×(-2)];(4)-14-16×[2-(-3)2].-数学

题目详情

计算:
(1)12-(-18)+(-7)-15;
(2)(-
1
6
+
3
4
-
5
12
)×(-12);
(3)42÷[(-2)2-(-5)×(-2)];
(4)-14-
1
6
×[2-(-3)2].
题型:解答题难度:中档来源:不详

答案

(1)原式=12+18-7-15=30-22=8;
(2)原式=(-class="stub"1
6
)×(-12)+class="stub"3
4
×(-12)-class="stub"5
12
×(-12)
=2-9+5=-2;
(3)原式=42÷(4-10)=42÷(-6)=-7;
(4)原式=-1-class="stub"1
6
×(2-9)
=-1-class="stub"1
6
×(-7)
=-1+class="stub"7
6
=class="stub"1
6

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