下列各题怎样简便就怎样算17+911+37+21112-(34-38)12-710-31056-(12+13)715+49+815.-数学

题目简介

下列各题怎样简便就怎样算17+911+37+21112-(34-38)12-710-31056-(12+13)715+49+815.-数学

题目详情

下列各题怎样简便就怎样算
1
7
+
9
11
+
3
7
+
2
11
1
2
-(
3
4
-
3
8
12-
7
10
-
3
10
5
6
-(
1
2
+
1
3
7
15
+
4
9
+
8
15
题型:解答题难度:中档来源:不详

答案

(1)class="stub"1
7
+class="stub"9
11
+class="stub"3
7
+class="stub"2
11

=(class="stub"1
7
+class="stub"3
7
)+(class="stub"2
11
+class="stub"9
11
),
=class="stub"4
7
+1,
=1class="stub"4
7


(2)class="stub"1
2
-(class="stub"3
4
-class="stub"3
8
),
=class="stub"1
2
-class="stub"3
8

=class="stub"1
8


(3)12-class="stub"7
10
-class="stub"3
10

=12-(class="stub"7
10
+class="stub"3
10
),
=12-1,
=11;

(4)class="stub"5
6
-(class="stub"1
2
+class="stub"1
3
),
=class="stub"5
6
-class="stub"5
6

=0;

(5)class="stub"7
15
+class="stub"4
9
+class="stub"8
15

=class="stub"7
15
+class="stub"8
15
+class="stub"4
9

=1+class="stub"4
9

=1class="stub"4
9

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