计算下面各题,能简算的要简算.213×59+49×213=512×79×45=(38+47)÷156=23×1322=514÷[728-(14+27)]=-数学

题目简介

计算下面各题,能简算的要简算.213×59+49×213=512×79×45=(38+47)÷156=23×1322=514÷[728-(14+27)]=-数学

题目详情

计算下面各题,能简算的要简算.
2
13
×
5
9
+
4
9
×
2
13
=

5
12
×
7
9
×
4
5
=
3
8
+
4
7
)÷
1
56
=
23×
13
22
=
5
14
÷[
7
28
-(
1
4
+
2
7
)]=
题型:解答题难度:中档来源:不详

答案

(1)class="stub"2
13
×class="stub"5
9
+class="stub"4
9
×class="stub"2
13

=class="stub"2
13
×(class="stub"5
9
+class="stub"4
9
),
=class="stub"2
13
×1,
=class="stub"2
13


(2)class="stub"5
12
×class="stub"7
9
×class="stub"4
5
=class="stub"7
27


(3)(class="stub"3
8
+class="stub"4
7
)÷class="stub"1
56

=(class="stub"3
8
+class="stub"4
7
)×56,
=class="stub"3
8
×56+class="stub"4
7
×56,
=21+32,
=53;

(4)23×class="stub"13
22

=(22+1)×class="stub"13
22

=22×class="stub"13
22
+1×class="stub"13
22

=13+class="stub"13
22

=13class="stub"13
22


(5)class="stub"5
14
÷[class="stub"7
28
-(class="stub"1
4
+class="stub"2
7
)],
=class="stub"5
14
÷[class="stub"7
28
-class="stub"7
28
-class="stub"2
7
],
=class="stub"5
14
÷[-class="stub"2
7
],
=-class="stub"5
14
×class="stub"7
2

=-class="stub"5
4

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