计算各题,能简便运算的写出主要过程.6.4÷89×524542×2425÷3635(4-0.4)×(29+23)[38-(16+13)]÷112.-数学

题目简介

计算各题,能简便运算的写出主要过程.6.4÷89×524542×2425÷3635(4-0.4)×(29+23)[38-(16+13)]÷112.-数学

题目详情

计算各题,能简便运算的写出主要过程.
6.4÷
8
9
×
5
24
5
42
×
24
25
÷
36
35
(4-0.4)×(
2
9
+
2
3
[
3
8
-(
1
6
+
1
3
)]÷
1
12
题型:解答题难度:中档来源:不详

答案

(1)6.4÷class="stub"8
9
×class="stub"5
24

=6.4×class="stub"9
8
×class="stub"5
24

=class="stub"3
2


(2)class="stub"5
42
×class="stub"24
25
÷class="stub"36
35

=class="stub"1
21
×class="stub"12
5
×class="stub"35
36

=class="stub"1
9


(3)(4-0.4)×(class="stub"2
9
+class="stub"2
3
),
=3.6×(class="stub"2
9
+class="stub"6
9
),
=3.6×class="stub"8
9

=3.2;

(4)[class="stub"3
8
-(class="stub"1
6
+class="stub"1
3
)]÷class="stub"1
12

=(class="stub"3
8
-class="stub"1
2
)×12,
=-class="stub"1
8
×12,
=-class="stub"3
2

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