计算(1)-3+8+(-7);(2)56-27+(-16)-57;(3)(12-59+712)×(-36);(4)(-23)4.-数学

题目简介

计算(1)-3+8+(-7);(2)56-27+(-16)-57;(3)(12-59+712)×(-36);(4)(-23)4.-数学

题目详情

计算
(1)-3+8+(-7);
(2)
5
6
-
2
7
+(-
1
6
)-
5
7

(3)(
1
2
-
5
9
+
7
12
)×(-36);
(4)(-
2
3
)4
题型:解答题难度:中档来源:不详

答案

(1)-3+8+(-7)
=-3+8-7
=-10+8
=-2;

(2)class="stub"5
6
-class="stub"2
7
+(-class="stub"1
6
)-class="stub"5
7

=(class="stub"5
6
-class="stub"1
6
)+(-class="stub"5
7
-class="stub"2
7

=class="stub"2
3
-1
=-class="stub"1
3


(3)(class="stub"1
2
-class="stub"5
9
+class="stub"7
12
)×(-36)
=-class="stub"1
2
×36+class="stub"5
9
×36-class="stub"7
12
×36
=-18+20-21
=-19;

(4)(-class="stub"2
3
)4
=class="stub"16
81

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