计算.(第(1)、(3)小题简算,写出主要过程)(1)21720÷7(2)715÷(1+425×56)(3)87.5×15+45×87.5-87.5(4)[1-(1-12×13)]÷15.-数学

题目简介

计算.(第(1)、(3)小题简算,写出主要过程)(1)21720÷7(2)715÷(1+425×56)(3)87.5×15+45×87.5-87.5(4)[1-(1-12×13)]÷15.-数学

题目详情

计算.(第(1)、(3)小题简算,写出主要过程)
(1)21
7
20
÷7
(2)
7
15
÷(1+
4
25
×
5
6

(3)87.5×
1
5
+
4
5
×87.5-87.5
(4)[1-(1-
1
2
×
1
3
)]÷
1
5
题型:解答题难度:中档来源:不详

答案

(1)21class="stub"7
20
÷7,
=(21+class="stub"7
20
)×class="stub"1
7

=21×class="stub"1
7
+class="stub"7
20
×class="stub"1
7

=3+class="stub"1
20

=3class="stub"1
20


(2)class="stub"7
15
÷(1+class="stub"4
25
×class="stub"5
6
),
=class="stub"7
15
÷(1+class="stub"2
15
),
=class="stub"7
15
÷1class="stub"2
15

=class="stub"7
15
×class="stub"15
17

=class="stub"7
17


(3)87.5×class="stub"1
5
+class="stub"4
5
×87.5-87.5,
=87.5×(class="stub"1
5
+class="stub"4
5
-1),
=87.5×0,
=87.5;

(4)[1-(1-class="stub"1
2
×class="stub"1
3
)]÷class="stub"1
5

=[1-(1-class="stub"1
6
)]÷class="stub"1
5

=[1-class="stub"5
6
class="stub"1
5

=class="stub"1
6
×5,
=class="stub"5
6

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