计算下面各题,怎样计算简便就怎样计算.89×25÷81523+(47+12)×725813÷7+17×513.-数学

题目简介

计算下面各题,怎样计算简便就怎样计算.89×25÷81523+(47+12)×725813÷7+17×513.-数学

题目详情

计算下面各题,怎样计算简便就怎样计算.
8
9
×
2
5
÷
8
15

2
3
+(
4
7
+
1
2
)×
7
25

8
13
÷7+
1
7
×
5
13
题型:解答题难度:中档来源:不详

答案

(1)class="stub"8
9
×class="stub"2
5
÷class="stub"8
15

=class="stub"8
9
×class="stub"2
5
×class="stub"15
8

=class="stub"8
9
×class="stub"15
8
×class="stub"2
5

=class="stub"5
3
×class="stub"2
5

=class="stub"2
3


(2)class="stub"2
3
+(class="stub"4
7
+class="stub"1
2
)×class="stub"7
25

=class="stub"2
3
+class="stub"15
14
×class="stub"7
25

=class="stub"2
3
+class="stub"3
10

=class="stub"29
30


(3)class="stub"8
13
÷7+class="stub"1
7
×class="stub"5
13

=class="stub"8
13
×class="stub"1
7
+class="stub"1
7
×class="stub"5
13

=(class="stub"8
13
+class="stub"5
13
)×class="stub"1
7

=1×class="stub"1
7

=class="stub"1
7

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