题目内容

97×
5
96
2
3
×
1
4
+
2
3
×
1
2
3
5
×18-7×
3
5
-
3
5
1
8
×58+42÷8
1
2
÷[(
7
10
+
4
15
)×30]
7
9
÷
11
5
+
2
9
×
5
11
分析:(1)把97看作96+1,运用乘法分配律简算;
(2)(3)运用乘法分配律简算;
(4)(6)把除法改为乘法,运用乘法分配律简算;
(5)中括号内运用乘法分配律简算,最后算括号外的除法.
解答:解:(1)97×
5
96

=(96+1)×
5
96

=96×
5
96
+1×
5
96

=5+
5
96

=5
5
96


(2)
2
3
×
1
4
+
2
3
×
1
2

=
2
3
×(
1
4
+
1
2
),
=
2
3
×
3
4

=
1
2


(3)
3
5
×18-7×
3
5
-
3
5

=
3
5
×(18-7-1),
=
3
5
×10,
=6;

(4)
1
8
×58+42÷8,
=
1
8
×58+42×
1
8

=
1
8
×(58+42),
=
1
8
×100,
=12.5;

(5)
1
2
÷[(
7
10
+
4
15
)×30],
=
1
2
÷[
7
10
×30+
4
15
×30],
=
1
2
÷[21+8],
=
1
2
÷29,
=
1
2
×
1
29

=
1
58


(6)
7
9
÷
11
5
+
2
9
×
5
11

=
7
9
×
5
11
+
2
9
×
5
11

=(
7
9
+
2
9
)×
5
11

=1×
5
11

=
5
11
点评:此题主要考查学生对乘法分配律的掌握与运用情况.
练习册系列答案
相关题目

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网