用自己喜欢的方法计算,□中填入适当的数后使计算简便.58÷34×925=49÷(13+16)×34=27×813+□×813=56×117+16÷□=-数学

题目简介

用自己喜欢的方法计算,□中填入适当的数后使计算简便.58÷34×925=49÷(13+16)×34=27×813+□×813=56×117+16÷□=-数学

题目详情

用自己喜欢的方法计算,□中填入适当的数后使计算简便.
5
8
÷
3
4
×
9
25
=

4
9
÷(
1
3
+
1
6
3
4
=
2
7
×
8
13
+□×
8
13
=
5
6
×
1
17
+
1
6
÷
□=
题型:解答题难度:中档来源:不详

答案

(1)class="stub"5
8
÷class="stub"3
4
×class="stub"9
25

=class="stub"5
6
×class="stub"9
25

=class="stub"3
10


(2)class="stub"4
9
÷(class="stub"1
3
+class="stub"1
6
)×class="stub"3
4

=class="stub"4
9
÷class="stub"1
2
×class="stub"3
4

=class="stub"8
9
×class="stub"3
4

=class="stub"2
3


(3)class="stub"2
7
×class="stub"8
13
+□×class="stub"8
13
要使本题计算简便,□中应填class="stub"5
7

class="stub"2
7
×class="stub"8
13
+class="stub"5
7
×class="stub"8
13

=(class="stub"2
7
+class="stub"5
7
)×class="stub"8
13

=1×class="stub"8
13

=class="stub"8
13


(4)class="stub"5
6
×class="stub"1
17
+class="stub"1
6
÷
□要使本题计算简便,□应填17.
class="stub"5
6
×class="stub"1
17
+class="stub"1
6
÷
17,
=class="stub"5
6
×class="stub"1
17
+class="stub"1
6
×class="stub"1
17

=(class="stub"5
6
+class="stub"1
6
)×class="stub"1
17

=1×class="stub"1
17

=class="stub"1
17

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