821÷87-78×52125%×813+513×1412×(12+34).-数学

题目简介

821÷87-78×52125%×813+513×1412×(12+34).-数学

题目详情

8
21
÷
8
7
-
7
8
×
5
21

25%×
8
13
+
5
13
×
1
4

12×(
1
2
+
3
4
)
题型:解答题难度:中档来源:不详

答案

class="stub"8
21
÷class="stub"8
7
-class="stub"7
8
×class="stub"5
21

=class="stub"8
21
×class="stub"7
8
-class="stub"7
8
×class="stub"5
21

=(class="stub"8
21
-class="stub"5
21
)×class="stub"7
8

=class="stub"3
21
×class="stub"7
8

=class="stub"1
8


25%×class="stub"8
13
+class="stub"5
13
×class="stub"1
4

=class="stub"1
4
×class="stub"8
13
+class="stub"5
13
×class="stub"1
4

=class="stub"1
4
×
class="stub"8
13
+class="stub"5
13
),
=class="stub"1
4
×1

=class="stub"1
4


12×(class="stub"1
2
+class="stub"3
4
)

=12×class="stub"1
2
+12×class="stub"3
4

=6+9,
=15.

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