下面各题能简算的要简算.67-(15+14)38+(49+58)712-(23-512)1-17-14.-数学

题目简介

下面各题能简算的要简算.67-(15+14)38+(49+58)712-(23-512)1-17-14.-数学

题目详情

下面各题能简算的要简算.
6
7
-(
1
5
+
1
4

3
8
+(
4
9
+
5
8

7
12
-(
2
3
-
5
12
1-
1
7
-
1
4
题型:解答题难度:中档来源:不详

答案

(1)class="stub"6
7
-(class="stub"1
5
+class="stub"1
4

=class="stub"6
7
-class="stub"9
20

=class="stub"57
140


(2)class="stub"3
8
+(class="stub"4
9
+class="stub"5
8

=class="stub"3
8
+class="stub"5
8
+class="stub"4
9

=1+class="stub"4
9

=1class="stub"4
9


(3)class="stub"7
12
-(class="stub"2
3
-class="stub"5
12

=class="stub"7
12
+class="stub"5
12
-class="stub"2
3

=1-class="stub"2
3

=class="stub"1
3


(4)1-class="stub"1
7
-class="stub"1
4

=class="stub"6
7
-class="stub"1
4

=class="stub"17
28

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