用自己喜欢的方法计算21÷(25÷815)34×15÷34×35715+815÷43.-数学

题目简介

用自己喜欢的方法计算21÷(25÷815)34×15÷34×35715+815÷43.-数学

题目详情

用自己喜欢的方法计算
21÷(
2
5
÷
8
15
)
3
4
×
1
5
÷
3
4
×
3
5
7
15
+
8
15
÷
4
3
题型:解答题难度:中档来源:不详

答案

(1)21÷(class="stub"2
5
÷class="stub"8
15
),
=21÷(class="stub"2
5
×class="stub"15
8
),
=21÷class="stub"3
4

=21×class="stub"4
3

=28;

(2)class="stub"3
4
×class="stub"1
5
÷class="stub"3
4
×class="stub"3
5

=class="stub"3
4
÷class="stub"3
4
×class="stub"1
5
×class="stub"3
5

=1×class="stub"1
5
×class="stub"3
5

=class="stub"3
25


(3)class="stub"7
15
+class="stub"8
15
÷class="stub"4
3

=class="stub"7
15
+class="stub"8
15
×class="stub"3
4

=class="stub"7
15
+class="stub"2
5

=class="stub"13
15

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