脱式计算.(能简便的要简便)(1)2005-395+605(2)16×125×21(3)14÷(1-13)(4)45-8×332(5)(56-45)÷415(6)4.8×96+4.8÷14.-数学

题目简介

脱式计算.(能简便的要简便)(1)2005-395+605(2)16×125×21(3)14÷(1-13)(4)45-8×332(5)(56-45)÷415(6)4.8×96+4.8÷14.-数学

题目详情

脱式计算.(能简便的要简便)
(1)2005-395+605
(2)16×125×21(3)
1
4
÷(1-
1
3
(4)
4
5
-8×
3
32
(5)(
5
6
-
4
5
)÷
4
15
(6)4.8×96+4.8÷
1
4
题型:解答题难度:中档来源:不详

答案

(1)2005-395+605,
=(2000+5)-(400-5)+(600+5),
=(2000-400+600)+5+5+5,
=2200+15,
=2215;

(2)16×125×21,
=2×8×125×21,
=2×21×(8×125),
=42×1000,
=42000;

(3)class="stub"1
4
÷(1-class="stub"1
3
),
=class="stub"1
4
÷class="stub"2
3

=class="stub"1
4
×class="stub"3
2

=class="stub"3
8


(4)class="stub"4
5
-8×class="stub"3
32

=class="stub"4
5
-class="stub"3
4

=class="stub"16
20
-class="stub"15
20

=class="stub"1
20


(5)(class="stub"5
6
-class="stub"4
5
)÷class="stub"4
15

=(class="stub"25
30
-class="stub"24
30
)÷class="stub"4
15

=class="stub"1
30
×class="stub"15
4

=class="stub"1
8


(6)4.8×96+4.8÷class="stub"1
4

=4.8×96+4.8×4,
=(96+4)×4.8,
=100×4.8,
=480.

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