题目内容

脱式计算,注意使用简便方法
①12×
3
8
÷
3
4

②(2+
2
9
)×18
1
2
×
3
5
+
2
5

④77×
4
5
+23×0.8
5
18
÷[(
5
7
-
1
3
)×
7
16
].
①12×
3
8
÷
3
4

=12×
4
3
×
3
8

=6;

②(2+
2
9
)×18
=2×18+
2
9
×18,
=36+4,
=40;

1
2
×
3
5
+
2
5

=
3
10
+
2
5

=
7
10


④77×
4
5
+23×0.8
=77×0.8+23×0.8,
=(77+23)×0.8,
=100×0.8,
=80;

5
18
÷[(
5
7
-
1
3
)×
7
16
]
=
5
18
÷[
8
21
×
7
16
],
=
5
18
×6,
=
5
3
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