下面各题,怎样简便就怎样算.4×4.9×2556×34+16÷437.6×9918÷[15×(25+110)]720÷15÷623+23÷1625+37+0.6+47(6+38)÷3.-数学

题目简介

下面各题,怎样简便就怎样算.4×4.9×2556×34+16÷437.6×9918÷[15×(25+110)]720÷15÷623+23÷1625+37+0.6+47(6+38)÷3.-数学

题目详情

下面各题,怎样简便就怎样算.
4×4.9×25
5
6
×
3
4
+
1
6
÷
4
3
7.6×99
1
8
÷[
1
5
×(
2
5
+
1
10
)]
720÷15÷6
2
3
+
2
3
÷
1
6
2
5
+
3
7
+0.6+
4
7
(6+
3
8
)÷3.
题型:解答题难度:中档来源:不详

答案

(1)4×4.9×25,
=(4×25)×4.9,
=4.9×100,
=490;

(2)class="stub"5
6
×class="stub"3
4
+class="stub"1
6
÷class="stub"4
3

=class="stub"5
6
×class="stub"3
4
+class="stub"1
6
×class="stub"3
4

=class="stub"3
4
×
class="stub"5
6
+class="stub"1
6
),
=class="stub"3
4
×1,
=class="stub"3
4


(3)7.6×99,
=7.6×(100-1),
=7.6×100-7.6,
=760-7.6,
=752.4;

(4)class="stub"1
8
÷[class="stub"1
5
×(class="stub"2
5
+class="stub"1
10
)],
=class="stub"1
8
÷[class="stub"1
5
×(class="stub"4
10
+class="stub"1
10
)];
=class="stub"1
8
÷class="stub"1
10

=class="stub"1
8
×10,
=class="stub"5
4

=1class="stub"1
4


(5)720÷15÷6,
=720÷(15×6),
=720÷90,
=8;
(6)class="stub"2
3
+class="stub"2
3
÷class="stub"1
6

=class="stub"2
3
+class="stub"2
3
×6,
=class="stub"2
3
+
4,
=4class="stub"2
3


(7)class="stub"2
5
+class="stub"3
7
+0.6+class="stub"4
7

=(class="stub"2
5
+class="stub"3
5
)+(class="stub"3
7
+class="stub"4
7
),
=1+1,
=2;

(8)(6+class="stub"3
8
)÷3,
=(6+class="stub"3
8
)×class="stub"1
3

=6×class="stub"1
3
+class="stub"3
8
×class="stub"1
3

=2+class="stub"1
8

=2class="stub"1
8

更多内容推荐