计算下面各题(能简算的要使用简便算法).310×(57-1021)613÷7+17×813(18+13-14)÷12457÷421÷1516.-数学

题目简介

计算下面各题(能简算的要使用简便算法).310×(57-1021)613÷7+17×813(18+13-14)÷12457÷421÷1516.-数学

题目详情

计算下面各题(能简算的要使用简便算法).
3
10
×(
5
7
-
10
21
6
13
÷7+
1
7
×
8
13
1
8
+
1
3
-
1
4
)÷
1
24
5
7
÷
4
21
÷
15
16
题型:解答题难度:中档来源:不详

答案


(1)class="stub"3
10
×(class="stub"5
7
-class="stub"10
21
),
=class="stub"3
10
×class="stub"5
21

=class="stub"1
14


(2)class="stub"6
13
÷7+class="stub"1
7
×class="stub"8
13

=class="stub"6
13
×class="stub"1
7
+class="stub"1
7
×class="stub"8
13

=(class="stub"6
13
+class="stub"8
13
)×class="stub"1
7

=class="stub"14
13
×class="stub"1
7

=class="stub"2
13


(3)(class="stub"1
8
+class="stub"1
3
-class="stub"1
4
)÷class="stub"1
24

=(class="stub"1
8
+class="stub"1
3
-class="stub"1
4
)×24,
=class="stub"1
8
×24+class="stub"1
3
×24-class="stub"1
4
×24,
=3+8-6,
=11-6,
=5;

(4)class="stub"5
7
÷class="stub"4
21
÷class="stub"15
16

=class="stub"15
4
÷class="stub"15
16

=4.

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