怎样算简便怎样算.59×34+59×14215+23×215.-数学

题目简介

怎样算简便怎样算.59×34+59×14215+23×215.-数学

题目详情

怎样算简便怎样算.
5
9
×
3
4
+
5
9
×
1
4
2
15
+
2
3
×
2
15
题型:解答题难度:中档来源:不详

答案

(1)class="stub"5
9
×class="stub"3
4
+class="stub"5
9
×class="stub"1
4

=class="stub"5
9
×
class="stub"3
4
+class="stub"1
4
),
=class="stub"5
9
×
1,
=class="stub"5
9


(2)class="stub"2
15
+class="stub"2
3
×class="stub"2
15

=1×class="stub"2
15
+class="stub"2
3
×class="stub"2
15

=class="stub"2
15
×
(1+class="stub"2
3
),
=class="stub"2
15
×class="stub"5
3

=class="stub"2
9

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