计算下面各题.①2297-156×720÷390②4.7×85+47×1.5③45+〔914×(56-49)〕④3-32×1021-27.-数学

题目简介

计算下面各题.①2297-156×720÷390②4.7×85+47×1.5③45+〔914×(56-49)〕④3-32×1021-27.-数学

题目详情

计算下面各题.
①2297-156×720÷390
②4.7×85+47×1.5
4
5
+〔
9
14
×(
5
6
-
4
9
)〕
④3-
3
2
×
10
21
-
2
7
题型:解答题难度:中档来源:不详

答案

①2297-156×720÷390,
=2297-112320÷390,
=2297-288,
=2009;

②4.7×85+47×1.5,
=4.7×85+4.7×15,
=4.7×(85+15),
=4.7×100,
=470;

class="stub"4
5
+[class="stub"9
14
×(class="stub"5
6
-class="stub"4
9
)],
=class="stub"4
5
+[class="stub"9
14
×class="stub"7
18
],
=class="stub"4
5
+class="stub"1
4

=class="stub"21
20


④3-class="stub"3
2
×class="stub"10
21
-class="stub"2
7

=3-class="stub"5
7
-class="stub"2
7

=3-(class="stub"5
7
+class="stub"2
7
),
=3-1,
=2.

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