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仔细观察,合理计算113×118×18×26734×13+34×2758+58×5+58×27×13×(87-1413)117×49+517×193839×40.

题目详情
仔细观察,合理计算
1
13
×
1
18
×18×
26
7
3
4
×13+
3
4
×27
5
8
+
5
8
×5+
5
8
×2
7×13×(
8
7
-
14
13
1
17
×
4
9
+
5
17
×
1
9
38
39
×40.
▼优质解答
答案和解析
(1)
1
13
×
1
18
×18×
26
7

=(
1
13
×
26
7
)×(18×
1
18
),
=
2
7
×1,
=
2
7


(2)
3
4
×13+
3
4
×27
=(13+27)×
3
4

=40×
3
4

=30;

(4)
5
8
+
5
8
×5+
5
8
×2
=(1+5+2)×
5
8

=8×
5
8

=5;

(5)7×13×(
8
7
-
14
13

=7×13×
8
7
-7×13×
14
13

=104-98,
=6;

(6)
38
39
×40
=
38
39
×(39+1),
=
38
39
×39+
38
39

=38+
38
39

=38
38
39