用你自己喜欢的方法进行计算.(1)1213+719+113;(2)1312-310-710;(3)56+14+23;(4)14+(65-720).-数学

题目简介

用你自己喜欢的方法进行计算.(1)1213+719+113;(2)1312-310-710;(3)56+14+23;(4)14+(65-720).-数学

题目详情

用你自己喜欢的方法进行计算.
(1)
12
13
+
7
19
+
1
13
; (2)
13
12
-
3
10
-
7
10

(3)
5
6
+
1
4
+
2
3
;(4)
1
4
+(
6
5
-
7
20
)
题型:解答题难度:中档来源:不详

答案

(1)class="stub"12
13
+class="stub"7
19
+class="stub"1
13

=class="stub"12
13
+class="stub"1
13
+class="stub"7
19

=1+class="stub"7
19

=1class="stub"7
19

(2)class="stub"13
12
-class="stub"3
10
-class="stub"7
10

=class="stub"13
12
-(class="stub"3
10
+class="stub"7
10
),
=class="stub"13
12
-1,
=class="stub"1
12

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

=class="stub"10
12
+class="stub"3
12
+class="stub"8
12

=class="stub"21
12

=class="stub"7
4

(4)class="stub"1
4
+(class="stub"6
5
-class="stub"7
20
)

=class="stub"1
4
+(class="stub"24
20
-class="stub"7
20
),
=class="stub"1
4
+class="stub"17
20

=class="stub"5
20
+class="stub"17
20

=class="stub"11
10

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