怎样简便怎样计算.(1)14+710-35(2)1-819-1119(3)56-(23-16)(4)58+917+38+817.-数学

题目简介

怎样简便怎样计算.(1)14+710-35(2)1-819-1119(3)56-(23-16)(4)58+917+38+817.-数学

题目详情

怎样简便怎样计算.
(1)
1
4
+
7
10
-
3
5

(2)1-
8
19
-
11
19
(3)
5
6
-(
2
3
-
1
6
(4)
5
8
+
9
17
+
3
8
+
8
17
题型:解答题难度:中档来源:不详

答案

(1)class="stub"1
4
+class="stub"7
10
-class="stub"3
5

=class="stub"1
4
+(class="stub"7
10
-class="stub"6
10
),
=class="stub"1
4
+class="stub"1
10

=class="stub"7
20


(2)1-class="stub"8
19
-class="stub"11
19

=1-(class="stub"8
19
+class="stub"11
19
),
=1-1,
=0;

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

=class="stub"5
6
+class="stub"1
6
-class="stub"2
3

=1-class="stub"2
3

=class="stub"1
3


(4)class="stub"5
8
+class="stub"9
17
+class="stub"3
8
+class="stub"8
17

=(class="stub"5
8
+class="stub"3
8
)+(class="stub"8
17
+class="stub"9
17
),
=1+1,
=2.

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