计算.712+45+51234-(34-12)415-17+1115-6712-17+13.-数学

题目简介

计算.712+45+51234-(34-12)415-17+1115-6712-17+13.-数学

题目详情

计算.
7
12
+
4
5
+
5
12
3
4
-(
3
4
-
1
2
)
4
15
-
1
7
+
11
15
-
6
7
1
2
-
1
7
+
1
3
题型:解答题难度:中档来源:不详

答案

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

=(class="stub"7
12
+class="stub"5
12
)+class="stub"4
5

=1+class="stub"4
5

=1class="stub"4
5


(2)class="stub"3
4
-(class="stub"3
4
-class="stub"1
2
)

=class="stub"3
4
-class="stub"3
4
+class="stub"1
2

=class="stub"1
2


(3)class="stub"4
15
-class="stub"1
7
+class="stub"11
15
-class="stub"6
7

=(class="stub"4
15
+class="stub"11
15
)-(class="stub"1
7
+class="stub"6
7
)

=1-1,
=0;

(4)class="stub"1
2
-class="stub"1
7
+class="stub"1
3

=class="stub"21
42
-class="stub"6
42
+class="stub"14
42

=class="stub"21-6+14
42

=class="stub"29
42

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