脱式计算,能简算的要简算.[1-(14+38)]÷12417×23÷(45-815)75-7.5+25-421217+78×57+380.8×4×12.5×2.565-40÷123×12.5%-数学

题目简介

脱式计算,能简算的要简算.[1-(14+38)]÷12417×23÷(45-815)75-7.5+25-421217+78×57+380.8×4×12.5×2.565-40÷123×12.5%-数学

题目详情

脱式计算,能简算的要简算.
[1-(
1
4
+
3
8
)]÷
1
24
1
7
×
2
3
÷(
4
5
-
8
15
75-7.5+25-42
1
2
1
7
+
7
8
×
5
7
+
3
8
0.8×4×12.5×2.565-40÷1
2
3
×12.5%
题型:解答题难度:中档来源:不详

答案

(1)[1-(class="stub"1
4
+class="stub"3
8
)]÷class="stub"1
24

=[1-class="stub"5
8
class="stub"1
24

=class="stub"3
8
÷class="stub"1
24

=9;

(2)class="stub"1
7
×class="stub"2
3
÷(class="stub"4
5
-class="stub"8
15
),
=class="stub"1
7
×class="stub"2
3
÷class="stub"4
15

=class="stub"2
21
÷class="stub"4
15

=class="stub"5
14


(3)75-7.5+25-42class="stub"1
2

=(75+25)-(7.5+42class="stub"1
2
),
=100-50,
=50;

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

=class="stub"1
7
+class="stub"5
8
+class="stub"3
8

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


(5)0.8×4×12.5×2.5,
=(0.8×12.5)×(2.5×4),
=10×10,
=100;

(6)65-40÷1class="stub"2
3
×12.5%,
=65-24×12.5%,
=65-3,
=62.

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