下面各题,怎样简便就怎样算.(38+45)×4034+58×2549×415+415×59(27+421)×716911×115×73(89-512)×217.-数学

题目简介

下面各题,怎样简便就怎样算.(38+45)×4034+58×2549×415+415×59(27+421)×716911×115×73(89-512)×217.-数学

题目详情

下面各题,怎样简便就怎样算.
(
3
8
+
4
5
)×40
3
4
+
5
8
×
2
5
4
9
×
4
15
+
4
15
×
5
9
(
2
7
+
4
21
7
16
9
11
×
11
5
×
7
3
(
8
9
-
5
12
2
17
题型:解答题难度:中档来源:不详

答案

(1)(class="stub"3
8
+class="stub"4
5
)×40

=class="stub"3
8
×40+class="stub"4
5
×40,
=15+32,
=47;

(2)class="stub"3
4
+class="stub"5
8
×class="stub"2
5

=class="stub"3
4
+class="stub"1
4

=1;

(3)class="stub"4
9
×class="stub"4
15
+class="stub"4
15
×class="stub"5
9

=class="stub"4
15
×(class="stub"4
9
+class="stub"5
9
),
=class="stub"4
15
×1,
=class="stub"4
15


(4)(class="stub"2
7
+class="stub"4
21
)×class="stub"7
16

=class="stub"10
21
×class="stub"7
16

=class="stub"5
24


(5)class="stub"9
11
×class="stub"11
5
×class="stub"7
3

=class="stub"9
5
×class="stub"7
3

=class="stub"21
5


(6)(class="stub"8
9
-class="stub"5
12
)×class="stub"2
17

=class="stub"17
36
×class="stub"2
17

=class="stub"1
18

更多内容推荐