首页 > 怎样简便就怎样算．35×18×5967×25+25×9724×27×512×213940×392006×2004200552×78+78×112．-数学

怎样简便就怎样算．35×18×5967×25+25×9724×27×512×213940×392006×2004200552×78+78×112．-数学

题目简介

怎样简便就怎样算．35×18×5967×25+25×9724×27×512×213940×392006×2004200552×78+78×112．-数学

题目详情

怎样简便就怎样算．
3
5
×18×
5
9

6
7
×
2
5
+
2
5
×
9
7

24×
2
7
×
5
12
×21
39
40
×39
2006×
2004
2005

5
2
×
7
8
+
7
8
×
11
2
．
题型：解答题难度：中档来源：不详

答案

（1）class="stub"3
5
×18×class="stub"5
9

=class="stub"3
5
×（18×class="stub"5
9
）
=class="stub"3
5
×10
=6；

（2）class="stub"6
7
×class="stub"2
5
+class="stub"2
5
×class="stub"9
7

=（class="stub"6
7
+class="stub"9
7
）×class="stub"2
5

=class="stub"15
7
×class="stub"2
5

=class="stub"6
7


（3）24×class="stub"2
7
×class="stub"5
12
×21
=（21×class="stub"2
7
）×（class="stub"5
12
×24）
=6×10
=60；

（4）class="stub"39
40
×39
=class="stub"39
40
×（40-1）
=class="stub"39
40
×40-class="stub"39
40

=39-class="stub"39
40

=38class="stub"1
40
；

（5）2006×class="stub"2004
2005

=（2005+1）×class="stub"2004
2005

=2005×class="stub"2004
2005
+class="stub"2004
2005

=2004+class="stub"2004
2005

=2004class="stub"2004
2005
；

（6）class="stub"5
2
×class="stub"7
8
+class="stub"7
8
×class="stub"11
2

=（class="stub"5
2
+class="stub"11
2
）×class="stub"7
8

=8×class="stub"7
8

=7．

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