计算下面各题,怎样简便就怎样计算.①118×79+79×718②87×386③14×757+327×25%-14④(75-40%)÷25×54.-数学

题目简介

计算下面各题,怎样简便就怎样计算.①118×79+79×718②87×386③14×757+327×25%-14④(75-40%)÷25×54.-数学

题目详情

计算下面各题,怎样简便就怎样计算.
11
8
×
7
9
+
7
9
×
7
18

②87×
3
86

1
4
×7
5
7
+3
2
7
×25%-
1
4

④(
7
5
-40%)÷
2
5
×
5
4
题型:解答题难度:中档来源:不详

答案

class="stub"11
8
×class="stub"7
9
+class="stub"7
9
×class="stub"7
18

=(class="stub"11
18
+class="stub"7
18
)×class="stub"7
9

=1×class="stub"7
9

=class="stub"7
9


②87×class="stub"3
86

=(86+1)×class="stub"3
86

=86×class="stub"3
86
+class="stub"3
86

=3+class="stub"3
86

=3class="stub"3
86


class="stub"1
4
×7class="stub"5
7
+3class="stub"2
7
×25%-class="stub"1
4

=class="stub"1
4
×7class="stub"5
7
+3class="stub"2
7
×class="stub"1
4
-class="stub"1
4

=(7class="stub"5
7
+3class="stub"2
7
-1)×class="stub"1
4

=10×class="stub"1
4

=class="stub"5
2


④(class="stub"7
5
-40%)÷class="stub"2
5
×class="stub"5
4

=(1.4-0.4)×class="stub"5
2
×class="stub"5
4

=1×class="stub"5
2
×class="stub"5
4

=class="stub"25
8

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