计算.①221+521-721②815-15-13③12+(34-49)④25+78+18⑤811+15-15⑥1-59-49.-数学

题目简介

计算.①221+521-721②815-15-13③12+(34-49)④25+78+18⑤811+15-15⑥1-59-49.-数学

题目详情

计算.
2
21
+
5
21
-
7
21
8
15
-
1
5
-
1
3
1
2
+(
3
4
-
4
9
2
5
+
7
8
+
1
8
8
11
+
1
5
-
1
5
⑥1-
5
9
-
4
9
题型:解答题难度:中档来源:不详

答案

class="stub"2
21
+class="stub"5
21
-class="stub"7
21

=class="stub"7
21
-class="stub"7
21

=0;

class="stub"8
15
-class="stub"1
5
-class="stub"1
3

=class="stub"1
3
-class="stub"1
3

=0;

class="stub"1
2
+(class="stub"3
4
-class="stub"4
9

=class="stub"1
2
+class="stub"11
36

=class="stub"29
36


class="stub"2
5
+class="stub"7
8
+class="stub"1
8

=class="stub"2
5
+(class="stub"7
8
+class="stub"1
8
),
=class="stub"2
5
+1,
=1class="stub"2
5


class="stub"8
11
+class="stub"1
5
-class="stub"1
5

=class="stub"8
11
+(class="stub"1
5
-class="stub"1
5

=class="stub"8
11
+0,
=class="stub"8
11


⑥1-class="stub"5
9
-class="stub"4
9

=1-(class="stub"5
9
+class="stub"4
9

=1-1,
=0.

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