下面各题,怎样简便就怎样算.421×78×1829+12÷45+38(12+23+34)×2412×(34-16)1723÷23+623÷2312×25+910÷920.-数学

题目简介

下面各题,怎样简便就怎样算.421×78×1829+12÷45+38(12+23+34)×2412×(34-16)1723÷23+623÷2312×25+910÷920.-数学

题目详情

下面各题,怎样简便就怎样算.
4
21
×
7
8
×18
2
9
+
1
2
÷
4
5
+
3
8
1
2
+
2
3
+
3
4
)×24
12×(
3
4
-
1
6
17
23
÷
2
3
+
6
23
÷
2
3
1
2
×
2
5
+
9
10
÷
9
20
题型:解答题难度:中档来源:不详

答案

(1)class="stub"4
21
×class="stub"7
8
×18=3;

(2)class="stub"2
9
+class="stub"1
2
÷class="stub"4
5
+class="stub"3
8

=class="stub"2
9
+class="stub"1
2
×class="stub"5
4
+class="stub"3
8

=class="stub"2
9
+class="stub"5
8
+class="stub"3
8

=class="stub"2
9
+(class="stub"5
8
+class="stub"3
8
),
=class="stub"2
9
+1,
=1class="stub"2
9


(3)(class="stub"1
2
+class="stub"2
3
+class="stub"3
4
)×24,
=class="stub"1
2
×24+class="stub"2
3
×24+class="stub"3
4
×24,
=12+16+18,
=46;

(4)12×(class="stub"3
4
-class="stub"1
6
),
=12×class="stub"3
4
-12×class="stub"1
6

=9-2,
=7;

(5)class="stub"17
23
÷class="stub"2
3
+class="stub"6
23
÷class="stub"2
3

=class="stub"17
23
×class="stub"3
2
+class="stub"6
23
×class="stub"3
2

=(class="stub"17
23
+class="stub"6
23
)×class="stub"3
2

=1×class="stub"3
2

=class="stub"3
2


(6)class="stub"1
2
×class="stub"2
5
+class="stub"9
10
÷class="stub"9
20

=class="stub"1
5
+class="stub"9
10
×class="stub"20
9

=class="stub"1
5
+2,
=2class="stub"1
5

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