脱式计算(能简便的要用简便方法计算)(1)16+15+13(2)712+16-14(3)811+715-815(4)7-(34-15)(5)45-(415+13)(6)47+521-47+221.-数

题目简介

脱式计算(能简便的要用简便方法计算)(1)16+15+13(2)712+16-14(3)811+715-815(4)7-(34-15)(5)45-(415+13)(6)47+521-47+221.-数

题目详情

脱式计算(能简便的要用简便方法计算)
(1)
1
6
+
1
5
+
1
3
(2)
7
12
+
1
6
-
1
4
(3)
8
11
+
7
15
-
8
15
(4)7-(
3
4
-
1
5
)
(5)
4
5
-(
4
15
+
1
3
)
(6)
4
7
+
5
21
-
4
7
+
2
21
题型:解答题难度:中档来源:不详

答案

(1)class="stub"1
6
+class="stub"1
5
+class="stub"1
3

=class="stub"11
30
+class="stub"1
3

=class="stub"7
10


(2)class="stub"7
12
+class="stub"1
6
-class="stub"1
4

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

=1;

(3)class="stub"8
11
+class="stub"7
15
-class="stub"8
15

=class="stub"8
11
-class="stub"1
15

=class="stub"109
165


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

=7-class="stub"11
20

=6class="stub"9
20


(5)class="stub"4
5
-(class="stub"4
15
+class="stub"1
3
)

=class="stub"4
5
-class="stub"9
15

=class="stub"1
5


(6)class="stub"4
7
+class="stub"5
21
-class="stub"4
7
+class="stub"2
21

=(class="stub"4
7
-class="stub"4
7
)+(class="stub"5
21
+class="stub"2
21
),
=0+class="stub"1
3

=class="stub"1
3

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