计算下面各题.①56×79×35×914②57×38+58×57③15÷[(23+15)×113]④(23+415×56)÷2021.-数学

题目简介

计算下面各题.①56×79×35×914②57×38+58×57③15÷[(23+15)×113]④(23+415×56)÷2021.-数学

题目详情

计算下面各题.
5
6
×
7
9
×
3
5
×
9
14
5
7
×
3
8
+
5
8
×
5
7
1
5
÷[(
2
3
+
1
5
)×
1
13
]
④(
2
3
+
4
15
×
5
6
)÷
20
21
题型:解答题难度:中档来源:不详

答案

class="stub"5
6
×class="stub"7
9
×class="stub"3
5
×class="stub"9
14

=(class="stub"5
6
×class="stub"3
5
)×(class="stub"7
9
×class="stub"9
14
),
=class="stub"1
2
×class="stub"1
2

=class="stub"1
4


class="stub"5
7
×class="stub"3
8
+class="stub"5
8
×class="stub"5
7

=class="stub"5
7
×(class="stub"3
8
+class="stub"5
8
),
=class="stub"5
7
×1,
=class="stub"5
7


class="stub"1
5
÷[(class="stub"2
3
+class="stub"1
5
)×class="stub"1
13
],
=class="stub"1
5
÷[class="stub"13
15
×class="stub"1
13
],
=class="stub"1
5
÷class="stub"1
15

=3;

④(class="stub"2
3
+class="stub"4
15
×class="stub"5
6
)÷class="stub"20
21

=(class="stub"2
3
+class="stub"2
9
)÷class="stub"20
21

=class="stub"8
9
×class="stub"21
20

=class="stub"14
15

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