怎样简便怎样算.①78÷5+78÷2②1.05×(3.8-0.8)÷6.3③920÷[12×(25+45)].-数学

题目简介

怎样简便怎样算.①78÷5+78÷2②1.05×(3.8-0.8)÷6.3③920÷[12×(25+45)].-数学

题目详情

怎样简便怎样算.
7
8
÷5+
7
8
÷2
②1.05×(3.8-0.8)÷6.3
9
20
÷[
1
2
×(
2
5
+
4
5
)].
题型:解答题难度:中档来源:不详

答案

class="stub"7
8
÷5+class="stub"7
8
÷2,
=class="stub"7
8
×class="stub"1
5
+class="stub"7
8
×class="stub"1
2

=class="stub"7
8
×(class="stub"1
5
+class="stub"1
2
),
=class="stub"7
8
×class="stub"7
10

=class="stub"49
80


②1.05×(3.8-0.8)÷6.3,
=1.05×3÷6.3,
=3.15÷6.3,
=0.5;

class="stub"9
20
÷[class="stub"1
2
×(class="stub"2
5
+class="stub"4
5
)],
=class="stub"9
20
÷[class="stub"1
2
×class="stub"6
5
],
=class="stub"9
20
÷class="stub"3
5

=class="stub"9
20
×class="stub"5
3

=class="stub"3
4

更多内容推荐