递等式计算(能简算的要简算):112+38+(58+512)89-(118+79)79+112-111823+67-23+673-1726+152612-1115+12-415.-数学

题目简介

递等式计算(能简算的要简算):112+38+(58+512)89-(118+79)79+112-111823+67-23+673-1726+152612-1115+12-415.-数学

题目详情

递等式计算(能简算的要简算):
1
12
+
3
8
+(
5
8
+
5
12
8
9
-(
1
18
+
7
9
7
9
+
1
12
-
11
18
2
3
+
6
7
-
2
3
+
6
7
3-
17
26
+
15
26
1
2
-
11
15
+
1
2
-
4
15
题型:解答题难度:中档来源:不详

答案

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

=(class="stub"1
12
+class="stub"5
12
)+(class="stub"3
8
+class="stub"5
8
),
=class="stub"1
2
+1,
=1class="stub"1
2


(2)class="stub"8
9
-(class="stub"1
18
+class="stub"7
9

=class="stub"8
9
-class="stub"7
9
-class="stub"1
18

=class="stub"1
9
-class="stub"1
18

=class="stub"1
18


(3)class="stub"7
9
+class="stub"1
12
-class="stub"11
18

=class="stub"31
36
-class="stub"11
18

=class="stub"1
4


(4)class="stub"2
3
+class="stub"6
7
-class="stub"2
3
+class="stub"6
7

=(class="stub"2
3
-class="stub"2
3
)+(class="stub"6
7
+class="stub"6
7
),
=0+class="stub"12
7

=class="stub"12
7


(5)3-class="stub"17
26
+class="stub"15
26

=3-(class="stub"17
26
-class="stub"15
26
),
=3-class="stub"2
26

=2class="stub"12
13


(6)class="stub"1
2
-class="stub"11
15
+class="stub"1
2
-class="stub"4
15

=(class="stub"1
2
+class="stub"1
2
)-(class="stub"11
15
+class="stub"4
15
),
=1-1,
=0.

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