算一算.78-512+345-(215+512)23+(25-310)-数学

题目简介

算一算.78-512+345-(215+512)23+(25-310)-数学

题目详情

算一算.
7
8
-
5
12
+
3
4
5-(
2
15
+
5
12
2
3
+(
2
5
-
3
10
题型:解答题难度:中档来源:不详

答案

(1)class="stub"7
8
-class="stub"5
12
+class="stub"3
4

=class="stub"21
24
-class="stub"10
24
+class="stub"18
24

=class="stub"11
24
+class="stub"18
24

=class="stub"29
24


(2)5-(class="stub"2
15
+class="stub"5
12
),
=5-(class="stub"8
60
+class="stub"25
60
),
=5-class="stub"11
20

=4class="stub"9
20


(3)class="stub"2
3
+(class="stub"2
5
-class="stub"3
10
),
=class="stub"2
3
+class="stub"1
10

=class="stub"23
30

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